SeasonMapKumamoto weather in August
Japan
August in Kumamoto: sweltering, soaked, with muggy air — a gamble, with 14 rainy days.
#11 of 12 months in Kumamoto · #1169 of 1383 destinations to visit in August · comfort 54/100 (tier D)
Updated September 2026 · climate normals from ERA5 reanalysis
Traveller notes on Kumamoto in August
No notes yet. Open Kumamoto on the map to add the first one.
Kumamoto climate normals — August
| Daytime high | 34°C / 93°F | 🔥 sweltering |
|---|---|---|
| Nighttime low | 25°C / 78°F | |
| Feels like (high) | 39°C / 102°F | |
| Sea temperature | 29°C / 85°F | ♨️ bath-warm |
| Rainfall | 204 mm / 8 in | ⛈ soaked |
| Rainy days | 14 days | |
| Humidity | 80% | 💦 very humid |
| Dew point | 23°C / 74°F | |
| Sunshine | 9.7 h/day | |
| Daylight | 13.3 h | |
| Wind | 12 km/h / 8 mph | |
| Air quality (US AQI) | 51 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
Crowds in Kumamoto in August
How busy the place itself is — school and mass holidays, the months an editor tagged, and how sought-after the weather makes them. Never part of the comfort score.
BusySummer break (natsuyasumi) in Japan, school holidays in 3 of the markets that fill it(estimated)
Peak crowdsBusyShoulder seasonQuiet
Best months for Kumamoto's weather
Ranked by this destination's own climate comfort score across the year — a different thing from how busy it gets (see Crowds above).
Toughest weatherKumamoto's best weather comes in April, October and November — separate windows, not one continuous season.
August coincides with Mount Aso crater alerts.
Best weatherFair weatherToughest weather
What's on in Kumamoto in August
Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.
- Hazard
Mount Aso crater alerts
1 Jan – 31 DecVolcanic activityClosuresNakadake is the day trip everyone books and the one that gets cancelled: the crater rim closes without notice on gas readings or a raised alert, and has been shut for long stretches. Check before you drive out. Source ↗
- Hazard
Typhoon season
1 Aug – 30 Sep · usuallyClosuresKyushu takes more direct hits than anywhere else in Japan and a landfall stops the trains and the airport for a day. Storms are not spread evenly through the year and these are the two months. Source ↗
Nearby, and something's on
Within 300 km of Kumamoto — a day trip or a short hop — with something on this month. Never part of the comfort score.
Where is Kumamoto?
Kumamoto in August — FAQ
- Is August a good time to visit Kumamoto?
- August in Kumamoto: sweltering, soaked, with muggy air — a gamble, with 14 rainy days. It ranks #11 of 12 months for Kumamoto on SeasonMap's comfort score (54/100).
- What is the weather like in Kumamoto in August?
- In August, Kumamoto averages a daily high of 33.9°C and a low of 25.3°C, with about 203.6 mm of rain over roughly 13.8 rainy days.
- What is the air quality in Kumamoto in August?
- Kumamoto has a mean US Air Quality Index of about 51 in August.
Other months in Kumamoto
Compare Kumamoto in August
Warmer or cooler than Kumamoto in August
Similar destinations in East Asia — August
Within 300 km: Busan's Beaches officially open around 1 Jul – 31 Aug, and Hiroshima's Peace Memorial Ceremony on 6 Aug.