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Weather extremes

How extreme does Kumamoto's weather get?

The hottest, coldest, wettest and snowiest days Kumamoto has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 34 years of daily weather observations (1991–present), from the Kumamoto station 1 km away. Updated through August 2025 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Kumamoto has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day
102°F Jul 16, 1994

That is about 13°F hotter than a normal July afternoon in Kumamoto (typical high near 89°F).

The three most extreme on record

1 102°F Jul 16, 1994
2 102°F Jul 17, 1994
3 102°F Aug 4, 2024
❄️ Coldest night
20°F Feb 3, 2012

About 15°F colder than a normal February night in Kumamoto (typical low near 35°F).

The three most extreme on record

1 20°F Feb 3, 2012
2 20°F Feb 2, 2012
3 20°F Jan 25, 2016
🌧️ Most rain in one day
11.34 in Jul 12, 2003

About 74% of a typical July's rain in a single day (Kumamoto averages roughly 15.4 in across the month).

The three most extreme on record

1 11.34 in Jul 12, 2003
2 9.92 in Jul 10, 1997
3 9.76 in Jul 3, 2023

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

-10°10°30°50°70°90°110°130° all-time high 102°F JanFebMarAprMayJunJulAugSepOctNovDec
normal range of daily temperatureshottest ever recordedcoldest ever recorded

Kumamoto's record heat sits well above even a hot day for the season — July's 102°F is about 13°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Kumamoto's warmest days reach the low 90s°F and its coldest nights drop to the low 30s°F. But across the record it has gone as high as 102°F and as low as 20°F. A single day has delivered over 11 inches of rain. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.
Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from the Japan Meteorological Agency, measured at Kumamoto, about 2 km from the city centre.

How we build these numbers →