Kumamoto has a warm temperate climate with warm summers and mild winters.
Kumamoto has an average annual temperature of 15.6°C across all 32 cities, with approximately 2088 mm of annual precipitation and average humidity of 82%. Temperatures peak in August and drop to their lowest in January, while rainfall is highest during summer months.
The warmest city is Sekimachi with average July highs of 29.4°C, while Minamiaso is the coldest with average January lows of -2.7°C. Humidity remains high throughout the year creating warm and humid conditions. These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | 🌤️ | 8.7°C | 4.8°C | 0.9°C | 20.4°C | -10.7°C | 81% | 63 | 1.6 | 2.40 |
| February | ⛅ | 10.3°C | 5.9°C | 1.6°C | 22.2°C | -10.8°C | 79% | 92 | 1.7 | 3.20 |
| March | ⛅ | 14.1°C | 9.3°C | 4.5°C | 23.8°C | -7.9°C | 79% | 144 | 1.6 | 4.00 |
| April | 🌧️ | 18.9°C | 13.9°C | 9.0°C | 28.3°C | -4.1°C | 78% | 164 | 1.4 | 4.90 |
| May | 🌧️ | 23.0°C | 18.3°C | 13.5°C | 31.9°C | 2.5°C | 80% | 201 | 1.2 | 5.10 |
| June | 🌧️ | 25.9°C | 22.0°C | 18.2°C | 32.9°C | 8.3°C | 84% | 393 | 1.1 | 4.40 |
| July | 🌧️ | 29.1°C | 25.7°C | 22.4°C | 35.6°C | 13.1°C | 86% | 340 | 1.2 | 5.00 |
| August | 🌧️ | 30.1°C | 26.5°C | 22.9°C | 37.8°C | 13.0°C | 84% | 229 | 1.1 | 5.10 |
| September | 🌧️ | 27.2°C | 23.4°C | 19.6°C | 35.2°C | 4.8°C | 84% | 209 | 1.2 | 4.30 |
| October | ⛅ | 22.1°C | 17.8°C | 13.5°C | 30.9°C | -2.2°C | 82% | 102 | 1.3 | 3.70 |
| November | ⛅ | 16.6°C | 12.4°C | 8.2°C | 26.2°C | -5.2°C | 82% | 88 | 1.4 | 2.80 |
| December | 🌤️ | 10.9°C | 7.0°C | 3.0°C | 22.5°C | -9.4°C | 81% | 64 | 1.5 | 2.30 |
Showing average climate conditions across 45 years (1981–2025) · averaged across all 32 cities in Kumamoto
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Early mornings and evenings are most comfortable during this Hot Summer season.
☔ Heavy Rainfall expected — carry rain gear and plan outdoor activities around these months.
Region-wide monthly averages across 32 cities · 1981–2025 · °C
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Region-wide monthly rainfall · 1981–2025 · mm/month
💧 Humidity peaks at 86% in July · annual avg 82%
Monthly averages · 1981–2025
Across 45 years, Kumamoto's temperature shows a slight warming trend over the past decade. 2024 was the warmest year overall and 1986 the coolest.
The warmest year on record was 2024 (avg: 17.2°C), while the coldest year was 1986 (avg: 14.6°C).
Averaged across all 32 cities in Kumamoto · Last 30 years · °C
Averaged across all 32 cities in Kumamoto · Last 30 years · mm/year
🔥 hottest · ❄️ coldest · 🌧️ wettest
ℹ️ Values are averages across all 32 cities in Kumamoto for each year.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 20.4°C | 16.4°C | 12.4°C | 37.8°C | -7.9°C | 2514 | 82% | 1.3 m/s |
2024 🔥 | 21.2°C | 17.2°C | 13.1°C | 36.1°C | -6.3°C | 2815 | 83% | 1.3 m/s |
2023 | 20.6°C | 16.5°C | 12.3°C | 34.2°C | -9.1°C | 2684 | 82% | 1.3 m/s |
2022 | 20.2°C | 16.1°C | 11.9°C | 34.3°C | -7.0°C | 2140 | 81% | 1.3 m/s |
2021 | 20.4°C | 16.3°C | 12.1°C | 33.5°C | -8.8°C | 2719 | 82% | 1.3 m/s |
2020 | 20.1°C | 15.9°C | 11.7°C | 35.8°C | -5.6°C | 2809 | 82% | 1.4 m/s |
2019 | 20.5°C | 16.3°C | 12.0°C | 34.1°C | -4.3°C | 2323 | 81% | 1.3 m/s |
2018 | 20.1°C | 15.9°C | 11.7°C | 35.3°C | -8.3°C | 2352 | 81% | 1.4 m/s |
2017 | 19.5°C | 15.5°C | 11.4°C | 34.8°C | -7.4°C | 2169 | 81% | 1.3 m/s |
2016 🌧️ | 20.5°C | 16.5°C | 12.5°C | 35.2°C | -8.7°C | 2964 | 83% | 1.3 m/s |
Showing 1 to 10 of 45 years
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
