Temperature records for Kumamoto
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Kumamoto, ―
Stations in Kumamoto
All-time records in Kumamoto
Records among the stations on this page (statistics as of November 1, 2026).
| Record | Station | Value | Date |
|---|---|---|---|
| Highest temperature | Kumamoto | 40.3°C | Aug 3, 2026 |
| Lowest temperature | Aso-Otohime | -14.8°C | Jan 25, 1998 |
| Heaviest daily rainfall | Aso-Otohime | 493.0 mm | Jul 12, 2012 |
Range of records by station
Each bar is one station: the left dot is its record low and the right dot its record high. The statistical period differs by station, depending on when observations began or the station moved. The dates are on each station's page.
The climate of Kumamoto
Summer in the city of Kumamoto ranks near the top in Japan. Over the 30 years of 1996–2025, the average August maximum in the city of Kumamoto reaches 33.5°C, sharing 6th place from the top among all the stations covered on this site. The record high is 40.3°C on August 3, 2026, and 38.9°C was observed both on the previous day and on the 26th of the same month, so the top 3 highs all fall in August 2026 alone.
Hitoyoshi, in the valley of the Kuma River, is a place of wide swings, as befits a basin at an elevation of 146 m. It rose to 39.2°C on August 2, 2026, while its -9.8°C on January 25, 2016, is the lowest among the stations covered here. The average January minimum is 0.2°C, 5.3°C apart from the 5.5°C of Ushibuka, at the southern tip of Amakusa. Ushibuka recorded 39.6°C on August 20, 2013.
The weight of rain remains in old records. The daily rainfall record among the stations covered here is 480.5 mm in the city of Kumamoto, observed on July 25, 1957. Hitoyoshi has 331.5 mm from July 3, 1995, and Ushibuka 363 mm from July 4, 2020. At Hitoyoshi, the share of days with less than 1 mm of precipitation is 65.6% for the year and only 48.2% in June, so the rainy-season rainfall shows in the numbers.
Record values in this description are based on data collected as of September 2026, and the normal statistics on the 30 years 1996–2025.
Monthly normals for Kumamoto (Kumamoto)
The normals for Kumamoto represent the stations in Kumamoto. Normals for the other stations are on each station's page.
Temperature (monthly normals)
The lines show monthly normals: the upper line is the monthly mean of the daily high and the lower line the monthly mean of the daily low, and the middle line is the monthly mean temperature. Touch the point for a month to read its values. Normals are the 1991–2020 average.
Precipitation (monthly normals, mm)
Table of monthly normals
| Month | Mean | High | Low | Precipitation |
|---|---|---|---|---|
| Jan | 6.0 | 10.7 | 1.6 | 57.2 |
| Feb | 7.4 | 12.4 | 2.6 | 83.2 |
| Mar | 10.9 | 16.1 | 5.9 | 124.8 |
| Apr | 15.8 | 21.4 | 10.6 | 144.9 |
| May | 20.5 | 26.0 | 15.6 | 160.9 |
| Jun | 23.7 | 28.1 | 20.2 | 448.5 |
| Jul | 27.5 | 31.8 | 24.2 | 386.8 |
| Aug | 28.4 | 33.3 | 24.8 | 195.4 |
| Sep | 25.2 | 30.1 | 21.2 | 172.6 |
| Oct | 19.6 | 25.0 | 14.9 | 87.1 |
| Nov | 13.5 | 18.8 | 8.8 | 84.4 |
| Dec | 8.0 | 12.9 | 3.4 | 61.2 |
Temperatures are in degrees Celsius (°C) and precipitation in mm. Blank cells have no normal.
Annual mean temperature (1996–2025)
The yearly average of the daily mean temperature (the line is broken in years with many missing values). Observing conditions at Kumamoto changed on January 26, 1999; December 4, 2007; June 25, 2008; October 22, 2015 (for example, a relocation or new instruments), so the statistics may not be continuous across those dates.
The normals listed here are averages over the 30 years from 1991 to 2020. They are fixed values that stay the same until the next revision of the normals, and they show how warm or cold that month usually is in that area.