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 →

Kumamoto🇯🇵 Japan · Mainland Japan · City86
  1. 66Jan
  2. 67Feb
  3. 73Mar
  4. 83Apr
  5. 77May
  6. 56Jun
  7. 50Jul
  8. 54Aug
  9. 62Sep
  10. 86Oct
  11. 81Nov
  12. 70Dec

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, Japan
Photo: Jan Bouken · Pexels

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.

MonthScoreTierHighRainSunCrowdsOn
Jan66C12°C9 d7 hBusy1
Feb67C13°C11 d7 hShoulder1
Mar73B17°C13 d8 hPeak2
Apr83A22°C11 d8 hPeak3
May77B26°C13 d8 hPeak2
Jun56D29°C16 d7 hQuiet1
Jul50D33°C15 d9 hBusy1
Aug54D34°C14 d10 hBusy2
Sep62C31°C14 d8 hBusy3
Oct86A26°C10 d8 hBusy1
Nov81A20°C9 d8 hBusy1
Dec70B13°C9 d7 hBusy1

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.

January
  • Mount Aso crater alerts1 Jan – 31 DecHazard
March
  • Castle cherry blossom25 Mar – 10 Apr (usually)Nature
April
  • Golden Week29 Apr – 5 MayHoliday
August
  • Typhoon season1 Aug – 30 Sep (usually)Hazard
September
  • Fujisaki Hachimangu autumn festival10–20 Sep (usually)Festival

Everything on in Kumamoto through the year →

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)

JFMAMJJASOND

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.
Tripadvisor community · April · 1 month ago · Read more on Tripadvisor ↗
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.
Tripadvisor community · October · 1 month ago · Read more on Tripadvisor ↗

Add your own note from Kumamoto's card on the map.