Kumamoto weather by month
2006-2025, 20 years of records · Not a forecast
Kumamoto has long hot summers and cold winter mornings. The rainy season peaks in June with the most wet days, and heavy rain can return in July. The clearest windows are late March for cherry blossoms and October. Kumamoto Castle was badly damaged in the 2016 earthquakes. The main keep was finished in 2019, but restoration of the rest will continue for decades, so check which areas are open before you go. The city centre is easy to cover by tram.
October scored best when warmth and rain days were weighed together. Rain clustered in June (up to 15 rain days) and fell to 5 rain days in January.
Each month in a line
| January | crisp and chilly, occasional rain | 11° / 1° |
|---|---|---|
| February | chilly, occasional rain | 13° / 3° |
| March | cool and fresh | 17° / 6° |
| April | cool | 22° / 11° |
| May | comfortably warm | 26° / 16° |
| June | hot, rain every other day | 28° / 20° |
| July | seriously hot, frequent rain | 32° / 25° |
| August | very hot | 34° / 25° |
| September | properly hot | 31° / 22° |
| OctoberGood | comfortably warm | 26° / 16° |
| November | cool, occasional rain | 19° / 9° |
| December | crisp and chilly, occasional rain | 13° / 3° |
The 12 months in numbers
The warmest month, August (34°C), and the coldest, January (11°C), were 23°C apart.
| Month | High | Low | Rain days | Rainfall | Humidity | Clear days |
|---|---|---|---|---|---|---|
| January | 11° | 1° | 5 days | 55mm | 69% | 5 days |
| February | 13° | 3° | 8 days | 93mm | 69% | 4 days |
| March | 17° | 6° | 11 days | 127mm | 69% | 6 days |
| April | 22° | 11° | 10 days | 141mm | 70% | 5 days |
| May | 26° | 16° | 10 days | 185mm | 73% | 5 days |
| June | 28° | 20° | 15 days | 434mm | 81% | 1 day |
| July | 32° | 25° | 13 days | 392mm | 82% | 4 days |
| August | 34° | 25° | 12 days | 276mm | 78% | 6 days |
| September | 31° | 22° | 9 days | 142mm | 76% | 6 days |
| October | 26° | 16° | 6 days | 91mm | 72% | 10 days |
| November | 19° | 9° | 7 days | 73mm | 72% | 7 days |
| December | 13° | 3° | 7 days | 60mm | 70% | 5 days |
Enter your dates to see how that stretch went in each of the past 20 years.
Common questions
When is the best time to visit Kumamoto?
October scored best when warmth and rain days were weighed together. Rain clustered in June (up to 15 rain days) and fell to 5 rain days in January.
Which month is driest in Kumamoto?
January. Over 2006-2025 it averaged 5 rain days and 55 mm of rain.
Which month is warmest in Kumamoto?
August, with highs averaging 34°C and lows 25°C. The warmest month, August (34°C), and the coldest, January (11°C), were 23°C apart.