Summary of Weather and Temperatures (October 4–October 10): Many Sunny Days Across Honshu; Some Locations Saw No Precipitation

2026/10/15 21:45

A summary of the weather and temperatures from October 4 to October 10, 2026.
Weather Overview for This Period

Atmospheric Pressure Patterns
On the 4th, a high-pressure system moved eastward over the waters east of Japan, while a low-pressure system moved eastward near the Bohai Sea. A large, very strong Typhoon No. 25 moved northward over the waters east of the Ogasawara Islands. On the 5th, a low-pressure system accompanied by a front moved northeastward across the Sea of ??Japan, occluding near the Primorsky Krai (Maritime Province). A front moved eastward, extending from the Hokuriku region to Hokkaido. A large, very strong Typhoon No. 27 moved northward over the waters east of the Ogasawara Islands. On the 6th, the large, strong Typhoon No. 27 continued its northward path east of the Ogasawara Islands. Meanwhile, a low-pressure system moved northeastward through the Strait of Tartary (Mamiya Strait), and a front passed over Hokkaido. Additionally, a front remained stationary east of Japan. On the 7th, the large Typhoon No. 27 moved northward east of Japan, while a high-pressure system from Central China extended toward the vicinity of Japan. On the 8th, Typhoon No. 28 and Typhoon No. 29 both moved westward in the vicinity of Minamitorishima. While the area around Japan was largely under the influence of a high-pressure system, a trough of low pressure formed near Kyushu. On the 9th, Typhoon No. 28 continued moving westward near Minamitorishima, while Typhoon No. 29 moved northwestward in the same area. On the 10th, most of Honshu was under the influence of a high-pressure system. A low-pressure system developed over the East China Sea. Typhoon No. 28 moved northward over the waters east of Japan, while the very strong Typhoon No. 29 moved northwestward near Minamitorishima.
Precipitation
On the 4th, rain clouds associated with a pressure trough spread over Western Japan?which was situated on the trailing side of a high-pressure system?bringing rain, particularly to the Pacific-facing regions of Western Japan. Atmospheric instability also led to heavy rainfall, with 39 mm/h recorded on Miyako Island. On the 5th, a front extending from a low-pressure system over the Sea of ??Japan brought rain to the Sea of ??Japan-facing sides of Hokkaido and the Tohoku region, as well as the Hokuriku region. Meanwhile, atmospheric instability over the Sakishima Islands resulted in scattered convective rainfall. On the 6th, as a front passed over Hokkaido, developed rain clouds moved through until dawn, bringing heavy to intense rainfall?including a rate of 33.5 mm/h in Iwamizawa City. During the day, localized rain occurred along the Sea of ??Japan coast, stretching from the Hokuriku region to Western Japan. On the 7th, although much of the country was covered by a high-pressure system, localized rain fell in the San'in and Tokai regions. On the 8th, the weather was clear nationwide, though Okinawa experienced rain due to the influence of moist air. On the 9th, Kyushu and Okinawa saw rain caused by a pressure trough and moist air circulating along the periphery of a high-pressure system; a pressure trough also brought rain to parts of northern Hokkaido. On the 10th, rain clouds developed near the southern Kyushu to Amami region due to a pressure trough, with some areas?such as Kikai Island?recording heavy rainfall of 36.5 mm/h. In Hokkaido, localized frontal activity brought rain to parts of the northern region.
Temperatures
On the 4th, temperatures in Western Japan dropped due to cold rain. The high in Kochi reached 20.8C?a level typical for early November?while Osaka saw a high of 21.4C, typical for late October. On the 5th, temperatures in parts of the Chugoku and Shikoku regions fell more than 4C below the seasonal average. Daily highs included 21.1C in Okayama City and 20.5C in Takamatsu City?levels consistent with late October. Temperatures of 19.5C in Tokushima City and 20.9C in Kochi City were both typical for early November. On the 6th, as a weather front moved away, many regions saw clear skies, with temperatures rising?particularly across the Kanto to Tokai regions. Shizuoka even experienced a "midsummer-like day" (temperatures reaching 30C or higher). In central Tokyo, a high of 27.4C was recorded?a level typical for mid-September. On the 7th, a "west-high, east-low" pressure pattern developed, allowing cooler air to flow into the lower atmosphere around Japan; temperatures at the 850 hPa level were approximately 3C below the seasonal average. On the 8th, while western and eastern Japan experienced chilly morning temperatures due to radiative cooling, temperatures rose during the day. In Nobeyama, where temperatures dropped below freezing, the daily temperature range reached 17C. On the 9th, much of the country fell under the influence of a high-pressure system, resulting in clear autumn weather in most areas. Temperatures in many places exceeded the seasonal average, with some locations?such as Shibecha Town in Hokkaido?recording a daily temperature range of over 20. On the 10th, a high-pressure system covered a wide area, leading to "summer-like days" (temperatures of 25 or higher) across regions from Tohoku to Kyushu. Maximum temperatures included 23.4 in Sapporo, 26.5 in Tokyo, and 28.3 in Fukuoka?all levels typical for mid-to-late September.

Summary of Weather During This Period (October 4 ? October 10)
Average temperatures were higher than normal in Hokkaido, influenced by warm air associated with a low-pressure system that passed near Sakhalin. In other regions, temperatures were generally close to the seasonal average.
Regarding precipitation, much of Japan was covered by transient high-pressure systems, resulting in lower-than-average rainfall across most of the country. Precipitation was notably well below average along the Pacific side of northern and eastern Japan, as well as in Kyushu, with several locations recording 0 mm of rainfall. Meanwhile, along the Sea of ??Japan coast in Hokkaido, some areas experienced higher-than-average precipitation due to the influence of weather fronts and moist air.
As for sunshine duration, many regions?excluding Kyushu and Shikoku?saw levels above the seasonal average, thanks to the influence of high-pressure systems; in areas stretching from the Kinki region to Hokkaido, some locations recorded figures significantly higher than average. Conversely, Kyushu and Shikoku were affected by moist air flowing from the south along the periphery of high-pressure systems, leading to some areas in northern Kyushu experiencing sunshine durations below the seasonal average.

[Breaking News] Typhoon 30 has formed—the first such occurrence in 13 years.

2026/10/15 16:41

A tropical depression near the Marshall Islands intensified into Typhoon 30 (Champa) at 3:00 PM today, Thursday, the 15th.



Typhoon 30 is expected to move west-northwest while gaining strength. It is forecast to reach "strong" intensity as it approaches the Mariana Islands on the 18th, and by the 20th, it is expected to develop into a "very strong" typhoon while moving east of the Philippines.
Although there is a high degree of uncertainty regarding its subsequent path, there is a possibility that it could approach the vicinity of Japan sometime between the latter half of next week and the first half of the following week. Please stay tuned for further updates on the typhoon.

The formation of Typhoon 30 marks the first time such a number has been reached in 13 years?since 2013?indicating that the number of typhoons this year is higher than average.

Mostly sunny this weekend; next week may start with rain

2026/10/15 12:26

Today, Thursday the 15th, eastern and western Japan are under the influence of a high-pressure system, bringing sunshine to a wide area.
Meanwhile, a low-pressure system near Sakhalin is moving slowly northward, causing rain clouds and strong winds to persist across northern Japan.

This low-pressure system is expected to bring rough weather to northern Japan through tomorrow, the 16th.
Afterward, it will move slowly toward the northeast, while a high-pressure system gradually extends over the vicinity of Honshu.
By Saturday the 17th, the weather in northern Japan will also improve,
with sunshine expected across the entire country.
The weekend looks set to be a great time for outdoor activities in many regions.



Following this, a front moving eastward from the Asian continent is expected to reach the vicinity of Japan by Monday the 19th, the start of the new week.
On Monday, clouds are likely to spread across many areas,
and you should be prepared for sudden, heavy downpours as the front passes through.

Weather for tomorrow, Friday the 16th: Autumn-like clear skies across western and eastern Japan; risk of thunderstorms in northern Japan.

2026/10/15 12:06

Tomorrow, Friday the 16th, a high-pressure system moving in from the continent is expected to cover areas from Western to Eastern Japan. As a result, much of the region will enjoy clear, autumn-like weather. In many places, daily high temperatures will reach 25C or higher?a "summer-day" level?leading to a significant temperature difference throughout the day. Please be mindful of these fluctuations and adjust your clothing accordingly.



Meanwhile, in Northern Japan, a low-pressure system accompanied by a front is approaching from the Sea of ??Japan and is expected to move east of Japan by the evening. Parts of Hokkaido and the Sea of ??Japan side of the Tohoku region will likely see periods of rain. Rain is expected to begin in the early hours, primarily in Hokkaido; as the front moves southward, it will likely reach the northern part of Tohoku by the morning, and Yamagata and Niigata Prefectures by the afternoon. Due to the influence of warm, humid air and cold air in the upper atmosphere, the weather will become unstable?please be cautious of lightning strikes and sudden, heavy downpours.





Additionally, strong winds?currently affecting Hokkaido due to a low-pressure system over the Sea of ??Okhotsk?are expected to persist. With another low-pressure system passing through tomorrow, Friday the 16th, please remain cautious of strong winds and high waves, particularly across Northern Japan.

Weather forecast for today, the 15th (Thursday): Fair autumn weather across much of western and eastern Japan; strong winds and localized rain or thunderstorms in northern Japan.

2026/10/15 07:00

On Thursday, the 15th, Sunny Spot released its first forecast for the 2026 autumn foliage season across the country. Please use this information to help plan your autumn leaf-viewing trips.



The timing of peak autumn foliage is linked to temperatures during the autumn months (September through November). Generally, cooler temperatures cause the colors to peak earlier, while warmer temperatures delay the process.

This September, limited sunshine?caused by the autumn rain front stalling near Honshu?resulted in average temperatures nationwide that were close to normal levels. However, due to cool air, some areas in Eastern Japan experienced temperatures below the seasonal average. In early October, high-pressure systems became more dominant, leading to a trend of temperatures near or above average across Honshu.

Looking ahead, temperatures are expected to remain above average from mid-October through November. Consequently, the peak foliage season is predicted to arrive later than usual. This delay is expected to be particularly noticeable in the lowland areas of Eastern and Western Japan.



#Northern Japan
Northern Japan experienced a period of cool air and lower temperatures, particularly during the first half of September; this allowed the foliage to change color steadily in the high-altitude mountainous regions of Hokkaido. Many areas in northern Hokkaido are already expected to be at their peak.
As temperatures are forecast to remain above average through November, the peak foliage season at many locations will likely occur either around the usual time or later than normal. We forecast the peak viewing period for autumn foliage to be around November 4 in Sapporo, November 14 in Akita, and November 21 in Sendai.

#Eastern Japan
In Eastern Japan, average temperatures fell below seasonal norms at times during September, which likely spurred the onset of autumn coloration in some high-altitude mountainous areas. However, as temperatures are expected to remain above average through November, the peak viewing period in many regions will likely be delayed. In lowland areas, the peak is expected to arrive either around the usual time or later than average.
We forecast the peak viewing period for Tokyo to be around November 27.

#Western Japan
In Western Japan, average temperatures from September through early October were near or above seasonal norms, and this trend of warmer-than-average temperatures is expected to continue through November. Nevertheless, due to nighttime radiative cooling?which lowers temperatures by the following morning?many high-altitude mountainous areas are likely to reach their peak between mid- and late November.
In lowland areas, however, the peak is expected to arrive around the usual time or later, with many locations likely reaching their peak in December. We forecast the peak viewing period to be around December 2 for Osaka, December 9 for Kochi, and December 3 for Fukuoka.

Weather forecast for today, the 15th (Thursday): Fair autumn weather across much of western and eastern Japan; strong winds and localized rain or thunderstorms in northern Japan.

2026/10/15 06:41

Today, Thursday the 15th, a high-pressure system extending from the west will cover a wide area of ??Honshu, primarily across Western and Eastern Japan.

Many areas in Western and Eastern Japan will enjoy clear autumn weather. Daytime temperatures will hover around 25 C in Western Japan, creating conditions where you might even break a slight sweat in sunny spots. Eastern Japan is expected to see highs around 23 C, making for a pleasant day.



In the Tohoku region, a localized front?not depicted on standard weather charts?is likely to pass through during the afternoon. Consequently, the weather will deteriorate, bringing rain and thunderstorms to some areas. Parts of Niigata Prefecture may also experience brief rain or thunderstorms around evening. Even if it isn't raining when you head out, it would be wise to carry a folding umbrella.

Hokkaido will see rain?accompanied by localized thunderstorms?primarily during the morning hours. Due to cold air aloft, snow may fall in high-altitude mountainous areas. Additionally, the pressure gradient remains tight, meaning strong winds will persist from the previous day, Wednesday the 14th.
Gale warnings have been issued for parts of Hokkaido facing the Sea of ??Japan; please exercise caution regarding violent winds. Coastal areas should also be extremely vigilant against high waves.

Weather for tomorrow, the 15th (Thursday): Sunny, mainly in western Japan; caution advised regarding strong winds in parts of Hokkaido.

2026/10/14 18:59

As of 3:00 PM today, Wednesday the 14th, a developing low-pressure system is located near Sakhalin and moving northward. Although a cold front has already passed over Honshu, the influence of cold air aloft is causing scattered rain along the Sea of ??Japan coast from western to northern Japan. Strong winds are blowing near Hokkaido due to a steep pressure gradient, and gale warnings have been issued for some areas along the Sea of ??Japan coast.





The low-pressure system is expected to intensify further and move into the Sea of ??Okhotsk by tomorrow, Thursday the 15th. Consequently, caution regarding gale-force winds and high waves is advised for Hokkaido through tomorrow. Strong winds are also expected along the Sea of ??Japan coast in the Tohoku region. Due to cold air aloft, Hokkaido and northern Tohoku will see cloudy skies and rain?with thunderstorms in some areas?particularly along the Sea of ??Japan coast; it is a good idea to carry an umbrella if you go out.

Meanwhile, a high-pressure system moving in from the Asian continent is expected to cover the area around western Japan tomorrow, Thursday the 15th. As a result, many areas from western Japan to southern Tohoku will enjoy sunny weather. In western Japan, some locations may experience "summer-like days" with highs reaching 25C or above, so please wear clothing that allows for easy temperature adjustment.

A tropical depression near the Marshall Islands is likely to develop into Typhoon No. 30.

2026/10/14 15:45

A tropical depression has formed near the Marshall Islands.
It has a central pressure of 1004 hPa, with maximum sustained winds of 15 meters per second near the center and peak instantaneous gusts of 23 meters per second.
As of 12:00 PM today, Wednesday the 14th, the depression is moving southwest at a speed of approximately 15 kilometers per hour.

It is expected to shift its course to the west-northwest through tomorrow, Thursday the 15th,
and move westward at 25 kilometers per hour by Saturday the 17th.



Depending on its path, the system could affect weather conditions near Japan,
so please stay tuned for the latest updates.

If this tropical depression intensifies into a named typhoon, it will be designated as Typhoon No. 30.

This would mark the first time in 13 years?since 2013 (when 30 typhoons formed)?that the number of typhoons has reached or exceeded 30.

Weather for Today, Wednesday the 14th: Rain Across a Wide Area from Northern to Western Japan; Beware of Lightning and Strong Winds.

2026/10/14 07:26

Today, Wednesday the 14th, a low-pressure system will move northeast across the Sea of Japan, and a front will pass through northern and western Japan, bringing rain to a wide area.
As the front passes, there will be localized heavy downpours accompanied by thunder. Winds will also strengthen around the low-pressure system and front, creating a risk of driving rain.
If you are heading out, please carry a large umbrella and take precautions against lightning strikes and strong winds.



In the Hokkaido region, the center of the low-pressure system is expected to pass over the northern Sea of Japan, bringing rain to a wide area. The rain will gradually shift from west to east. However, on the Sea of Japan side, rain may persist into the night due to the influence of cold air.
Additionally, even after the low-pressure system moves away, a steep pressure gradient will cause very strong winds and high waves at sea; please exercise caution.

From the Tohoku region through eastern Japan, rainfall will intensify locally as a cold front passes, with heavy rain expected, particularly on the Sea of Japan side. Please be alert for lightning strikes and violent gusts, such as tornadoes.

In western Japan, the weather is tending to improve. Rain currently falling in some areas will gradually stop, and sunny spells are expected in the afternoon. Please be careful not to leave your umbrella behind.



As for high temperatures, cold air will flow in following the passage of the cold front, so maximum temperatures across the country will likely be lower than yesterday in many areas. Temperatures are expected to drop by as much as 6C compared to yesterday, particularly in areas along the Sea of Japan such as Akita, Yamagata, and Niigata. With highs just slightly above 20C, you will likely need long sleeves. It is also expected to get chilly at night, so please bring a warm outer layer if you plan to be out late.
On the other hand, maximum temperatures on the Pacific side will not drop as significantly; many areas across eastern and western Japan will see highs of 25C or higher?classified as a "summer day." Please dress in layers so you can adjust your clothing as needed.

Hokkaido should be on alert for strong winds and high waves from tomorrow, the 14th, through the 15th.

2026/10/13 21:18

A low-pressure system accompanied by a front is moving northeast across the Sea of Japan. This system is expected to intensify rapidly as it passes over the northern Sea of Japan tomorrow, Wednesday the 14th, and moves into the Sea of ??Okhotsk by the day after, Thursday the 15th.
Due to this intensifying low-pressure system, the pressure gradient near Hokkaido will steepen, likely resulting in very strong winds. Rough seas and high waves are also expected.
There is a possibility of warning-level gale-force winds and high waves, particularly along the Sea of Japan coast. Please be sure to check the latest information.



In the Hokkaido region, rain is forecast across a wide area tomorrow, Wednesday the 14th, as the front passes through. Winds will strengthen, and there is a risk of driving rain. Please exercise caution if you are going out.
High waves are also expected, especially along the Sea of Japan coast; please avoid approaching the shoreline as much as possible.
Forecasts for wind and waves are as follows:

[Wind Forecast Hokkaido]
Forecast maximum wind speeds (peak instantaneous wind speeds) for the 14th:
Northern Sea of Japan coast (land): 20 m/s (35 m/s)
Northern Sea of Japan coast (sea): 20 m/s (30 m/s)
Southern Sea of Japan coast (land): 18 m/s (30 m/s)
Southern Sea of Japan coast (sea): 20 m/s (30 m/s)
Forecast maximum wind speeds (peak instantaneous wind speeds) for the 15th:
Northern Sea of Japan coast (land): 20 m/s (35 m/s)
Northern Sea of Japan coast (sea): 20 m/s (30 m/s)
Southern Sea of Japan coast (land): 18 m/s (30 m/s)
Southern Sea of Japan coast (sea): 18 m/s (30 m/s)

[Wave Forecast Hokkaido]
Forecast wave heights for the 14th:
Northern Sea of Japan coast: 4 m
Southern Sea of Japan coast: 4 m
Forecast wave heights for the 15th:
Northern Sea of Japan coast: 5 m
Southern Sea of Japan coast: 5 m



[Disaster Prevention Information]

As a low-pressure system accompanied by a front passes through the Hokkaido region while rapidly intensifying, southerly winds will strengthen quickly to become very strong by the morning of tomorrow, the 14th (Wednesday). By nightfall, the wind will shift to a westerly direction and remain very strong through the day after tomorrow, the 15th (Thursday). Rough seas are expected.
In the northern part of the Sea of Japan side, please be on alert for violent winds from the morning of the 14th (Wednesday) through the 15th (Thursday).
Across the Sea of Japan side, please exercise caution regarding strong winds from the morning of the 14th (Wednesday) through the 15th (Thursday), and pay close attention to high waves on the 15th (Thursday).
Depending on the path and intensity of the low-pressure system, there is a risk that areas and timeframes affected by violent winds could expand, and seas could become very rough.
Additionally, in the southern part of the Sea of Japan side and the western part of the Pacific Ocean side, there is a risk of severe gusts (such as tornadoes), lightning strikes, hail, and sudden heavy rain from the early hours until late morning on the 14th (Wednesday). Please exercise caution during outdoor activities and when managing crops. If there are signs of approaching developed cumulonimbus clouds, please take steps to ensure your safety, such as moving into a sturdy building.