Kumamoto weather by month
The best time to visit Kumamoto is April, October and November — 86/100 in October, 26°C and 10 rainy days. The best season is spring, March to May (78/100 on average).
The worst month is July at 50/100 — sweltering, soaked, clean air. See July →
Updated September 2026 · climate normals from ERA5 reanalysis
Planning the wider trip? Best time to visit Japan →
Best season: March to May (78/100 on average) · worst July (50/100)
- Days
- 26°C
- Nights
- 15°C
- Wet days
- 10
- Sun
- 7.8 h
- Humidity
- 78%
- Daylight
- 11 h

Kumamoto, month by month
Comfort score out of 100 for the kind of trip Kumamoto is best for, the average high, rainy days and hours of sun a day from the climate normals, and how busy it tends to be.
What's on in Kumamoto through the year
Festivals, natural spectacles, holidays and the seasons to watch out for — curated and sourced. The month pages carry the detail.
Crowds in Kumamoto in October
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.
Busyschool holidays in 3 of the markets that fill it, one of its best months for weather(estimated)
Peak crowdsBusyShoulder seasonQuiet
Traveller notes on Kumamoto
What people who have been say about the place — the year-round notes first, then month by month.
Forum posters describe April across Japan as genuinely one of the best months to visit, though variable - a light anorak or jacket is recommended for cooler days and evenings, while sunny stretches can push temperatures into the mid-20sC, warranting layers that can come off as needed. Posters specifically recommend early April in northern Kyushu, including Kumamoto alongside Saga, Oita and Fukuoka, as a strong window for cherry blossoms. Posters generally note April doesn't require a heavy winter coat anywhere in Japan by this point in spring, distinguishing it clearly from the colder months just prior. Posters generally rate April as mild, changeable but genuinely rewarding for Kumamoto, sakura season a real seasonal highlight worth timing a visit around.
Forum posters call October broadly one of Japan's best travel months - warm days, cool nights, and even when a typhoon passes through, rain typically clears within a day or two back to clear blue skies rather than settling in. Early October can still run a touch warm, cooling noticeably by the end of the month. For Kumamoto specifically, posters note some tourist attractions may still be under restoration or closed depending on the year, but the castle grounds remain walkable and Suizenji Garden stays open regardless, giving visitors a reliable core itinerary even if other sites are affected.
Add your own note from Kumamoto's card on the map.