Climate averages 1991–2020
Kumamoto weather
in May.
A warm, wet month: the 5th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a warm month in Kumamoto: daytime highs average 23.2°C and nights cool to about 15.2°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 178 mm of rain on roughly 12 days, which makes May a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 50 min on an average May day.
The nearest other city in this atlas is Ōmuta (34 km away). In May its highs average 23.0°C, about as warm as Kumamoto, with 172 mm of rain.
Among the 303 cities listed in Japan, Kumamoto ranks joint 22nd of 303 for the warmest May highs and joint 264th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Kumamoto is 1.9°C warmer than that mean.
From May to June, average highs rise by 2.4°C to 25.7°C, and monthly rainfall rises from 178 mm to 403 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Kumamoto climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.0°C3.0°C | 3.0°C | 78 | 10.6 | 10.310 h |
| February | 10.5°C3.4°C | 3.4°C | 99 | 10.4 | 11.011 h |
| March | 14.0°C6.1°C | 6.1°C | 142 | 13.0 | 12.012 h |
| April | 18.8°C10.5°C | 10.5°C | 154 | 12.1 | 13.013 h |
| May, selected | 23.2°C15.2°C | 15.2°C | 178 | 11.9 | 13.814 h |
| June | 25.7°C19.4°C | 19.4°C | 403 | 17.0 | 14.314 h |
| July | 29.0°C23.2°C | 23.2°C | 301 | 16.2 | 14.114 h |
| August | 30.4°C24.0°C | 24.0°C | 135 | 13.0 | 13.413 h |
| September | 27.5°C20.8°C | 20.8°C | 156 | 11.7 | 12.412 h |
| October | 22.5°C15.1°C | 15.1°C | 98 | 8.3 | 11.411 h |
| November | 16.9°C9.7°C | 9.7°C | 92 | 8.8 | 10.511 h |
| December | 11.2°C4.9°C | 4.9°C | 84 | 10.0 | 10.010 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Ōmuta in MayJapan · 34 kmHigh 23.0°C · Low 15.0°C · 172 mm rain
- Honmachi in MayJapan · 35 kmHigh 23.8°C · Low 16.1°C · 174 mm rain
- Kurume in MayJapan · 59 kmHigh 23.8°C · Low 13.8°C · 170 mm rain
- Saga in MayJapan · 60 kmHigh 23.2°C · Low 14.4°C · 164 mm rain
- Amakusa in MayJapan · 61 kmHigh 23.3°C · Low 16.1°C · 181 mm rain
- Isahaya in MayJapan · 61 kmHigh 21.3°C · Low 15.8°C · 197 mm rain
- Tosu in MayJapan · 64 kmHigh 23.7°C · Low 13.8°C · 170 mm rain
- Ōmura in MayJapan · 70 kmHigh 22.2°C · Low 16.4°C · 173 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Kumamoto) is explained once on the Kumamoto year overview and on the Sources, method and limits page.