【daily‑changing weather】large temperature swings, with attention also on typhoon no.31(commentary: weather forecaster Junko miyake)

2026/10/29 14:58

weather points ahead
periodic changes in the weather
attention to the movement of typhoon no.31



a low-pressure system will bring rain, followed the next day by a winter-type pressure pattern,
and then the following day by high pressure.
this day-to-day cycle is expected to continue.

be mindful of daily weather changes and temperature swings.

details on typhoon no.31 will be provided later in the report.



toward tonight, the center of the high pressure system will move east of japan,
and moist air will flow in along the edge of the high.
even areas with sunshine now will gradually see increasing cloud cover.

a low-pressure system and a front will also approach hokkaido,
bringing rain and thunderstorms in some areas.

furthermore, a front is expected to form along the southern coast of honshu through tomorrow,
and widespread rain is likely.



now let's look at the rain cloud forecast.
from this evening (fri the 29th), rain is expected to begin in hokkaido.
there may be periods of heavier rain with thunder.

late tonight, snow may fall in high-elevation areas of hokkaido,
but most places will see rain.
thunderstorms are also possible,
so please watch for sudden heavy rain, lightning, and gusty winds.

later at night, rain will begin in parts of western japan as well.
after midnight, rain is also expected to start in the kanto region.



toward dawn, coastal areas of chiba may see stronger rainfall with thunder.
there is a chance of heavy rain.

in shikoku, including kochi, heavy rain with thunder may occur from the morning,
and in the kinki region from late morning.

in the afternoon, southern kanto will see only spotty light rain,
but northern kanto will become more prone to rain from the evening.
if you are heading out tomorrow, having an umbrella will be reassuring.

tomorrow night, some rain may linger in the tokai, kinki, and hokuriku regions.



now let's look at typhoon no.31.
as of 9 am today, it is near minami-torishima with very strong intensity,
moving westward at about 30 km/h.

its central pressure is 940 hPa, and because it will continue traveling over warm waters,
it is expected to maintain this strength through around nov 3.

depending on its track, it may approach the ogasawara islands, including chichijima, around nov 1.

the chance of entering the storm-force wind area is low,
but the strong-wind area may come close.
winds may strengthen and waves may become higher around nov 1,
so caution is advised.



the track after nov 3 remains uncertain.

a strong high pressure system will extend from the continent,
so the typhoon may continue westward,
or it may turn northeast.
please continue to check the latest updates.



now for the weather across the regions.
clouds will thicken through the rest of today.
in sapporo, rain will begin from evening,
and in western japan from tonight.
thunderstorms are likely in sapporo tonight.

tomorrow (sat), many areas will see rain.
tokyo and sendai show cloudy icons,
but light rain is possible.
please bring rain gear just in case.

in osaka and nagoya, temperatures will be lower tomorrow due to rain.
in sapporo, southerly winds will keep temperatures relatively high throughout the day.



weekly forecast:
on sunday the 1st, cold air will flow in and sapporo may see snow again.

on the 2nd, widespread rain is expected,
and on the 3rd, cold air will flow in again,
making snow more likely in sapporo through the 4th.

temperature swings will be significant,
so please take care to avoid getting sick.

【kanto】heavy rain and thunderstorms possible tomorrow (fri), plus the latest on typhoon no.31(commentary: weather forecaster Junko miyake)

2026/10/29 14:46

today (thu), the kanto region will see the weather deteriorate toward the night.



this is tonight's forecast weather chart.
the center of the high pressure system will move east of japan,
and warm, moist air will flow into the kanto region from the south.
clouds will gradually thicken through the evening.

furthermore, a front is expected to form along the southern coast of honshu through tomorrow.
due to its influence, the kanto region is likely to see rain tomorrow.



now let's look at the forecast for rain clouds.
starting from tonight:
around 9 pm, rain is expected to begin in areas such as chiba and ibaraki.
rain clouds will be more active along coastal areas through tomorrow morning.
in places like choshi and tateyama in chiba, heavy rain with thunder may occur toward dawn tomorrow.



after that, the rainy conditions will continue,
but around midday, rain clouds over chiba and ibaraki will gradually move eastward.

in the afternoon, the southern part of kanto will only see occasional light rain,
but northern kanto will become more prone to rain from tomorrow evening.
if you are going out tomorrow, having rain gear will be reassuring.



another point of concern is the movement of the typhoon.
currently, typhoon no.31 is near minami-torishima with very strong intensity,
moving westward at about 30 km/h.

its central pressure is 940 hPa, and because it will continue traveling over warm waters,
it is expected to maintain its strength through around nov 3.

depending on its course, it may approach the ogasawara islands, including chichijima, around nov 1.
the chance of entering the storm-force wind area is low,
but the strong-wind area may come close.

around nov 1, winds may strengthen and waves may become higher in the ogasawara region,
so caution is needed.



the forecast track after nov 3 remains highly uncertain.

a strong high pressure system will extend from the continent,
so the typhoon may continue westward,
or it may turn northeast.
please continue to check the latest information.



now let's look at the weather across the region.

clouds will thicken through the rest of today.
tomorrow, even areas without a rain icon may see light rain,
so carrying rain gear is recommended.

southerly winds will blow during the day tomorrow, keeping temperatures high.
tokyo will reach 21 degrees, and yokohama will rise to 23 degrees.



finally, the weekly forecast.

this weekend will be widely sunny.
saturday will be quite warm,
but sunday may feel chilly due to northerly winds.

culture day on nov 3 will also be sunny across the region.
it will be pleasantly mild during the day - perfect for outings.

however, on thu the 5th, widespread rain is expected.
temperatures will drop, and the rain may feel cold.
with large temperature swings ahead, please take care of your health.

Typhoon No. 31 (In-fa) is moving westward with very strong intensity.

2026/10/29 11:54

As of 9:00 a.m. on the 29th, a very strong Typhoon No. 31 is located in the waters near Minamitorishima, moving westward at a speed of 30 kilometers per hour.
The central pressure is 940 hPa, with maximum sustained winds of 45 meters per second and peak gusts of 65 meters per second. Strong winds of 15 meters per second or greater are blowing within a 330-kilometer radius of the center.

The typhoon is expected to shift its course toward the northwest by the morning of the 31st, and then move northward at a slow pace on November 1st.
Following this, it is projected to turn back toward the west and travel through the waters south of Japan.



Around Sunday, November 1st, the typhoon may pass through the waters near the Ogasawara Islands.
An early warning for high waves has been issued for the vicinity of the Ogasawara Islands. Please stay updated with the latest information.

Even if the typhoon itself remains at a distance, the influx of moist air can cause sudden, intense rainfall, leading to rapid changes in outdoor conditions.
Please regularly check for disaster prevention information and warnings issued by the Japan Meteorological Agency and local authorities, and be prepared for changing conditions.

Weekly weather forecast: Weather patterns will shift every few days, with strong cold air frequently pushing southward; also, keep an eye on the future path of Typhoon No. 31.

2026/10/29 07:46

Looking ahead, low- and high-pressure systems will pass near Honshu in a cycle lasting several days. At times, strong cold air from the upper atmosphere may also push southward toward the Honshu region.
Additionally, please keep an eye on the developments regarding Typhoon No. 31 next week.




Today, Thursday the 29th, clouds will gradually spread from the afternoon. Rain is expected to begin around evening in Hokkaido and along the coast of the Kanto region. By late tonight or the early hours of tomorrow, the 30th, rain may also start in parts of Kyushu and Shikoku.

Tomorrow, Friday the 30th, as low-pressure systems and troughs pass through, rain is expected to spread across a wide area from Northern Japan to Western Japan. In some places, the rain may intensify and be accompanied by thunderstorms.

The day after tomorrow, Saturday the 31st, a "west-high, east-low" pressure pattern will develop around Honshu, allowing strong cold air from the continent to flow in. As a result, snow is expected even in the lowlands of Hokkaido, and there is a risk of rough weather with strengthening winds, particularly in Northern Japan. Snow may also fall in mountainous areas, ranging from the northern Tohoku region to Eastern Japan. If you are driving over mountain passes, please be mindful of road conditions and stay updated with the latest traffic information.

At the start of next week, on Monday the 2nd, low-pressure systems and fronts will pass through, bringing rain to many areas. On Tuesday the 3rd?Culture Day?much of the country is expected to be under the influence of a high-pressure system, bringing clear skies and ideal weather for heading out.




Looking ahead, cold air will move southward in a cycle every few days, likely leading to significant temperature fluctuations between the day and the morning/evening hours. Please take care of your health.



Meanwhile, a very strong Typhoon No. 31 is moving westward over the ocean southeast of Japan. It is expected to continue its westward path without losing much intensity, likely reaching the waters south of the Ogasawara Islands by around Sunday the 1st. In the Ogasawara region, there is a risk of warning-level high waves around Sunday the 1st, so please stay tuned for further updates.

There is still a great deal of uncertainty regarding the typhoon's subsequent path; depending on its trajectory, it could significantly impact the weather in Okinawa and around the main island of Honshu. Please be sure to check the latest typhoon information as it becomes available.

"First cold autumn wind" (kogarashi ichigo) announced for Tokyo and Kinki regions—6 days earlier than last year

2026/10/28 19:38

Today, Wednesday the 28th, the first "winter-announcing north wind" (*kogarashi ichigo*) was officially declared for the Tokyo and Kinki regions.

Across Honshu today, Wednesday the 28th, a pressure pattern characterized by high pressure to the west and low pressure to the east developed, leading to strengthening northerly winds in various areas.

In Tokyo, an AMeDAS (Automated Meteorological Data Acquisition System) observation at 5:20 a.m. today recorded a peak instantaneous wind speed of 16.9 m/s from the northwest. In the Kinki region, speeds such as 15.2 m/s (north-northwesterly) in Hikone at 2:02 a.m. and 14.5 m/s (northerly) in Wakayama were recorded, meeting the criteria for the declaration of the first *kogarashi* of the season.

This year's first *kogarashi* declaration for the Tokyo and Kinki regions comes six days earlier than last year's (which occurred on November 3rd).

#Peak Instantaneous Wind Speeds in the Kinki Region
(As of 7:10 p.m. today, the 28th)

Osaka: 14.2 m/s, North (2:22 p.m.)
Kobe: 13.6 m/s, North (2:18 p.m.)
Kyoto: 10.2 m/s, North-northwest (12:30 p.m.)
Maizuru: 13.9 m/s, North (11:51 a.m.)
Hikone: 15.2 m/s, North-northwest (2:02 a.m.)
Nara: 11.2 m/s, North-northwest (12:48 a.m.)
Wakayama: 14.5 m/s, North (1:37 a.m.)

Signs of winter are arriving across Hokkaido; first snowfall recorded in various locations—including Sapporo and Hakodate—as well as in Aomori City.

2026/10/28 13:21

Today, Wednesday the 28th, the first snowfall of the season was recorded in Aomori City?the earliest such observation at any meteorological observatory on Japans main island (Honshu) this season. On the same day, the first snowfall was also reported in the Hokkaido cities of Abashiri, Kushiro, Obihiro, Sapporo, Muroran, and Hakodate. A "west-high, east-low" pressure pattern has developed around Japan, and a cold air mass?with temperatures at an altitude of approximately 1,500 meters over Hokkaido and Aomori dropping to -6C or lower?has moved into the region; this temperature threshold is typically the benchmark for snow to fall at ground level.



Banded clouds?a typical sight over the Sea of ??Japan during the winter?can be seen, with some of these cloud bands extending over parts of Hokkaido.



First Snow (Hokkaido)
Sapporo Same as the historical average (5 days later than last year)

Hakodate 4 days earlier than the historical average (same as last year)

Muroran 5 days earlier than the historical average (same as last year)

Kushiro 10 days earlier than the historical average (14 days earlier than last year)

Obihiro 4 days earlier than the historical average (same as last year)

Abashiri 2 days earlier than the historical average (8 days later than last year)

First Snow (Tohoku)
Aomori 11 days earlier than the historical average (14 days earlier than last year)

This strong cold air mass is expected to move east of Hokkaido by the morning of tomorrow, Thursday the 29th. Tomorrow in Hokkaido, skies will be mostly cloudy?particularly along the Sea of ??Japan coast?with rain likely to begin by the evening. As the atmosphere becomes unstable, please also be cautious of the risk of lightning. Additionally, temperatures will rise tomorrow due to the influence of southerly winds; the high in Sapporo is expected to reach 12C?about 6C warmer than today. As there will be significant day-to-day fluctuations in temperature, please take extra care to look after your health.

[Typhoon Information] Typhoon No. 31, currently very strong, is moving westward; caution advised regarding its path next week.

2026/10/28 12:10

As of 9:00 a.m. today, Wednesday the 28th, Typhoon No. 31 (In-fa)-a very strong storm-is moving westward at a speed of 15 km/h in the vicinity of the Marshall Islands.

Typhoon No. 31 Wednesday, the 28th, 9:00 a.m.
------------------------------------
Center Location: Marshall Islands
Size: -
Intensity: Very strong
Movement: West, 15 km/h
Central Pressure: 945 hPa
Maximum Sustained Wind Speed: 50 m/s (near the center)
Maximum Instantaneous Wind Speed: 70 m/s
------------------------------------



Outlook
Typhoon No. 31 is expected to continue moving westward while intensifying. It is projected to reach the waters near Minamitorishima on Thursday the 29th, and subsequently reach the waters near the Ogasawara Islands on Saturday the 31st, while maintaining its "very strong" intensity.
Those in the Ogasawara region should exercise caution regarding violent winds and high waves this coming weekend.

Future Path
While there is a high degree of uncertainty regarding its future path, several models indicate that the storm will turn toward the northeast during the first half of next week.
The latest forecasts show a track further to the north compared to yesterday's projections, suggesting it may move closer to the Japanese archipelago.
Depending on the path it takes, the storm could bring moist air, potentially leading to the development of active rain clouds along the Pacific coast. Please continue to check for the latest typhoon information.

Typhoon No. 30 moves northward near Okinawa, bringing extremely rough seas [Marine Summary (October 18–24, 2026)]

2026/10/28 07:39

"Typhoon No. 30 moved in a generally westward direction east of the Philippines before turning northward near Okinawa. As a result, wave heights increased across a wide area surrounding the typhoon, with extremely rough sea conditions occurring in regions stretching from south of Japan to south of Okinawa, as well as in the waters near Okinawa.

In the seas surrounding Japan, the area where sea surface temperatures were slightly higher than average expanded.

Summary of Ocean Conditions (October 18 - October 24, 2026)



# Pressure Patterns and Waves
On the 18th, a low-pressure system east of the Kamchatka Peninsula moved eastward. A steep pressure gradient between this system and a high-pressure area near Japan caused rough sea conditions in the Sea of Okhotsk. Strong winds also developed along the periphery of the high-pressure system, leading to rough seas south of Honshu.
From the 19th to the 20th, a low-pressure system moved from the Sea fo Japan toward the area east of the Kuril Islands (Chishima Islands). On the 19th, sea conditions were rough in the central part of the Sea fo Japan.
From the 19th to the 24th, Typhoon No. 30 moved westward east of the Philippines and then northward near Okinawa. Waves intensified over a broad area around the typhoon; from the 21st to the 23rd, extremely rough sea conditions were observed in waters from south of Japan to south of Okinawa, and in the vicinity of Okinawa.
From the 22nd to the 23rd, a low-pressure system accompanied by a front moved from the Sea of Okhotsk toward the area east of the Kamchatka Peninsula, resulting in rough seas in the Sea of Okhotsk and east of Japan.



# Sea Surface Temperatures
In the waters surrounding Japan, the area where sea surface temperatures were slightly higher than average expanded. Areas with sea temperatures higher-and in some cases, significantly higher-than average were observed, with temperatures reaching up to 4C above normal.
In the East China Sea, the area where temperatures are slightly above average has expanded.
Temperatures were slightly higher than average in the region stretching from the Nansei Islands to the waters off Shikoku and the Kanto region.
East of the Kanto region, areas with temperatures significantly higher than average have emerged, while off the Sanriku coast, the area with above-average temperatures has shrunk.
Southeast of Hokkaido, the area with temperatures significantly higher than average persists, with values ??reaching up to 5C above normal.
In the waters near the Kuril Islands and in the Sea of Okhotsk, temperatures remain slightly above average.

"

Be mindful of temperature fluctuations over the next week; adjust your clothing accordingly to manage your health.

2026/10/27 20:55

Tomorrow, Wednesday the 28th, cold air will move into Japan, causing temperatures to drop nationwide compared to today, Tuesday the 27th. The morning chill will intensify the day after tomorrow, Thursday the 29th, and the week ahead is expected to see significant fluctuations in temperature.
Please take care to adjust your clothing appropriately and stay mindful of your health.



Tomorrow, Wednesday the 28th, cold air from the upper atmosphere will shift southward. A temporary "west-high, east-low" pressure pattern will develop, drawing in further cold air and causing temperatures across the country to drop significantly compared to today, Tuesday the 27th.
In Hokkaido, snow may fall even in lowland areas, while cold rain is expected along the sea of Japan side of Honshu, creating a chilly atmosphere.
Along the Pacific coast, northerly winds will make the air feel quite cool.
Daily high temperatures will drop sharply-falling into the single digits in Hokkaido, hovering around 10C in the Tohoku region, and reaching approximately 15C along the sea of Japan side of eastern and western Japan (a significant decrease from today due to the cold air). Along the Pacific coast, highs will be around 20C.

On the morning of Thursday the 29th, the chill will intensify, with forecast lows of 3C in Sapporo, 9C in Niigata, 12C in Tokyo, 11C in Osaka, and 11C in Fukuoka. Some areas may experience their coldest temperatures of the season so far.

Looking further ahead, the periodic passage of low-pressure systems and fronts will bring changing weather and recurring influxes of cold air, leading to significant fluctuations in temperature. Temperatures are expected to rise in Northern Japan and the Hokuriku region around Friday the 30th, while in the Kanto region and Western Japan regions, daily highs may exceed 20C around Saturday the 31st.
In Northern Japan, temperatures will drop following the passage of low-pressure systems as colder air moves in-a cycle that will gradually usher in the next season.

Additionally, there may be significant temperature differences between the day and the morning or evening; please adjust your clothing accordingly-for instance, by keeping a warm outer layer on hand. Be sure to check the daily weather forecast and take care of your health during this seasonal transition.



While individual sensitivity to heat and cold varies, here is a general guide: a cardigan is typically needed when temperatures fall below 20C, while a trench coat or similar outerwear becomes appropriate when temperatures drop below 12C.
Please use this as a reference for choosing your attire based on the temperature.

Weather Summary (October 18–24): Record-breaking October rainfall in some areas due to Typhoon 30 and low-pressure systems

2026/10/27 18:56

A summary of the weather and temperatures from October 18 to October 24, 2026.

Weather Overview for the Period
Pressure Patterns
On the 18th, a low-pressure system accompanied by a front passed near the Korean Peninsula, while Typhoon No. 30 moved westward across the Mariana Islands. Japan was covered by a high-pressure system. On the 19th, Typhoon No. 30 moved west-northwest. A low-pressure system advanced toward the waters near the Kuril Islands, with a front extending across northern Japan and reaching as far as central China. On the 20th, a front extending from a low-pressure system remained stationary, stretching from east of Japan to central China. Typhoon No. 30 moved west-northwest east of the Philippines. A low-pressure system formed along the front over the Sea of ??Japan and moved northeast. On the 21st, Typhoon No. 30 continued moving west-northwest. A low-pressure system, intensifying rapidly, moved into the Sea of ??Okhotsk, while a front passed across the vicinity of Honshu. On the 22nd, Typhoon No. 30 moved west-northwest south of Okinawa. A low-pressure system intensified over the Sea of ??Okhotsk. Honshu came under the influence of a high-pressure system extending from the Asian continent, resulting in a "west-high, east-low" pressure pattern. On the 23rd, Typhoon No. 30 moved northward west of Yonaguni Island. A front remained stationary south of Japan, while Honshu was covered by a high-pressure system. On the 24th, Typhoon No. 30 moved northward near the Sakishima Islands. A front remained stationary, stretching from western to eastern Japan. During the evening, a low-pressure system formed along the front in the waters off the Kanto region and moved northeast.

Precipitation
On the 18th, localized rain occurred from the Pacific side of western Japan to the Nansei Islands, driven by moist air along the periphery of a high-pressure system. On the 19th, rain fell?primarily in northern and western Japan?due to the passage of a front and the influence of moist air along the periphery of a high-pressure system. Heavy rain was observed in Kochi Prefecture. On the 20th, a stationary front brought rain across regions from Northern to Western Japan. In Wakayama Prefecture, warm, moist air flowing along the edge of a high-pressure system caused extremely heavy rainfall, with 58.5 mm/h recorded in Nishikawa, Kozagawa Town. On the 21st, the passage of a front brought widespread rain across Honshu, while the Nansei Islands also experienced rain due to the influence of Typhoon No. 30. On the 22nd, a "west-high, east-low" pressure pattern developed; rain fell in the Hokuriku region, and the first snow of the season was observed in Wakkanai and Asahikawa, Hokkaido. In the Nansei Islands, rain accompanied by thunderstorms occurred due to Typhoon No. 30. On the 23rd, heavy rain associated with Typhoon No. 30 affected the Sakishima Islands in particular; Iriomote Island recorded a daily precipitation total of 322.0 mm, setting a new record for the month of October. A stationary front also brought heavy rain to the southern part of Kyushu. On the 24th, Typhoon No. 30 caused heavy rain, primarily in the Sakishima Islands. The influence of a front also led to heavy rainfall in areas such as the southeastern slopes of the Kii Peninsula and Tsushima in Nagasaki Prefecture; Owase City in Mie Prefecture recorded a daily precipitation total of 273.0 mm.

Temperatures
On the 18th, temperatures rose across Western Japan due to southerly winds on the trailing side of a high-pressure system, with some locations in Kyushu reaching "midsummer" levels (30C or higher). Inland areas experienced large diurnal temperature ranges; in Sugadaira, Nagano Prefecture, the difference between the daily high and low reached 21C. On the 19th, temperatures nationwide were higher than average, with some areas in southern Kyushu reaching midsummer levels. On the 20th, warm air to the south of a front kept temperatures across Honshu above average, and some locations in Kyushu again reached midsummer levels. On the 21st, strengthening southerly winds?directed toward a low-pressure system and a front?pushed temperatures nationwide above seasonal averages. A high of 33.6C was recorded in Hyuga City, Miyazaki Prefecture. On the 22nd, cold air moved southward toward Hokkaido, causing temperatures in some areas to drop to levels typical of November. Meanwhile, many locations across Honshu experienced "summer days" (daily highs of 25C or above). On the 23rd, the southward-moving cold air intensified the morning chill in Hokkaido, with the town of Rikubetsu recording a low of -5.9C. On the 24th, much of western and eastern Japan saw cloudy or rainy weather, and "midsummer-like" temperatures (daily highs of 30C or above) were limited to parts of the Southwestern Islands and southern Kyushu. In eastern Hokkaido, the influx of cold air combined with radiative cooling led to sub-zero morning temperatures in several locations.



Summary of Weather for the Period (October 18 ? October 24)
Average temperatures were higher than normal across western and eastern Japan, influenced by warm air along the periphery of high-pressure systems. In western Japan, many locations saw temperatures more than 3C above the seasonal average. In northern Japan, temperatures were slightly above average, while in Hokkaido, they were mostly in line with seasonal norms.
Precipitation was high, particularly in the Southwestern Islands?affected by a typhoon?and along the Sea of ??Japan side of Honshu, which was impacted by low-pressure systems and fronts. Some areas along the Pacific coast of western Japan also experienced heavy rainfall due to moist, warm air flowing along the edge of a high-pressure system. Conversely, the Kanto region saw less precipitation than usual, as it was affected by low-pressure systems and fronts for a shorter duration.
Sunshine duration was below average nationwide; although some parts of the country were covered by high-pressure systems at times, the overall period was marked by the influence of typhoons, low-pressure systems, and fronts. In some areas?notably in western Japan?sunshine duration was significantly lower than normal; for instance, in Hiroshima, it reached only about 30% of the seasonal average.