Kumamoto weather in June

June in Kumamoto: hot, soaked, with muggy air — a gamble, with 16 rainy days.

Updated September 2026 · climate normals from ERA5 reanalysis

Kumamoto🇯🇵 Japan · Mainland Japan · City56
  1. 66Jan
  2. 67Feb
  3. 73Mar
  4. 83Apr
  5. 77May
  6. 56Jun
  7. 50Jul
  8. 54Aug
  9. 62Sep
  10. 86Oct
  11. 81Nov
  12. 70Dec

#10 of 12 months in Kumamoto · #1170 of 1413 destinations to visit in June · comfort 56/100 (tier D)

Days
29°C
Nights
21°C
Wet days
16
Sun
6.9 h
Humidity
83%
Daylight
14 h
Kumamoto, Japan
Photo: Jan Bouken · Pexels

Traveller notes on Kumamoto in June

Other months in Kumamoto

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.

Kumamoto climate normals — June

Daytime high29°C / 84°F🥵 hot
Nighttime low21°C / 69°F
Feels like (high)32°C / 90°F
Sea temperature23°C / 74°F🙂 pleasant
Rainfall358 mm / 14.1 in⛈ soaked
Rainy days16 days
Humidity83%💦 very humid
Dew point19°C / 67°F
Sunshine6.9 h/day
Daylight14.3 h
Wind13 km/h / 8 mph
Air quality (US AQI)57🙂 moderate

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

Crowds in Kumamoto in June

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.

Quietschool holidays in 3 of the markets that fill it, one of its worst months for weather(estimated)

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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.

June coincides with Mount Aso crater alerts.

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Best weatherFair weatherToughest weather

What's on in Kumamoto in June

Recurring seasonal events, natural spectacles, closures and holidays — curated and sourced.

  • Hazard

    Mount Aso crater alerts

    1 Jan – 31 DecVolcanic activityClosures

    Nakadake 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 ↗

What's on around the world in June →

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?

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Kumamoto in June — FAQ

Is June a good time to visit Kumamoto?
June in Kumamoto: hot, soaked, with muggy air — a gamble, with 16 rainy days. It ranks #10 of 12 months for Kumamoto on SeasonMap's comfort score (56/100).
What is the weather like in Kumamoto in June?
In June, Kumamoto averages a daily high of 28.8°C and a low of 20.5°C, with about 358 mm of rain over roughly 16.3 rainy days.
What is the air quality in Kumamoto in June?
Kumamoto has a mean US Air Quality Index of about 57 in June.

Within 300 km: Yakushima's Loggerhead nesting around 10 May – 10 Jul, and Hiroshima's Miyajima visitor tax on 1 Jan – 31 Dec.