Climate averages 1991–2020
Saku weather
in May.
A mild, wet month: the 5th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Saku: daytime highs average 20.6°C and nights cool to about 10.6°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 131 mm of rain on roughly 15 days, which makes May a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 04 min on an average May day.
The nearest other city in this atlas is Ueda (27 km away). In May its highs average 21.1°C, about as warm as Saku, with 123 mm of rain.
Among the 303 cities listed in Japan, Saku ranks joint 230th of 303 for the warmest May highs and joint 90th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Saku is 0.7°C cooler than that mean.
From May to June, average highs rise by 2.8°C to 23.4°C, and monthly rainfall rises from 131 mm to 197 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
Saku climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.9°C-4.4°C | -4.4°C | 55 | 7.6 | 10.010 h |
| February | 4.8°C-4.4°C | -4.4°C | 58 | 8.1 | 10.811 h |
| March | 9.0°C-0.9°C | -0.9°C | 99 | 11.7 | 11.912 h |
| April | 15.6°C4.8°C | 4.8°C | 102 | 12.3 | 13.113 h |
| May, selected | 20.6°C10.6°C | 10.6°C | 131 | 14.9 | 14.114 h |
| June | 23.4°C15.3°C | 15.3°C | 197 | 19.8 | 14.615 h |
| July | 27.0°C19.3°C | 19.3°C | 220 | 21.6 | 14.414 h |
| August | 27.8°C20.2°C | 20.2°C | 174 | 21.5 | 13.514 h |
| September | 23.7°C16.4°C | 16.4°C | 187 | 17.6 | 12.412 h |
| October | 18.1°C10.1°C | 10.1°C | 161 | 12.9 | 11.311 h |
| November | 12.7°C3.9°C | 3.9°C | 64 | 7.8 | 10.310 h |
| December | 6.9°C-1.1°C | -1.1°C | 48 | 7.9 | 9.710 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
- Ueda in MayJapan · 27 kmHigh 21.1°C · Low 10.2°C · 123 mm rain
- Matsumoto in MayJapan · 46 kmHigh 20.7°C · Low 9.8°C · 156 mm rain
- Takasaki in MayJapan · 50 kmHigh 21.0°C · Low 11.1°C · 178 mm rain
- Azumino in MayJapan · 54 kmHigh 20.6°C · Low 9.9°C · 156 mm rain
- Shibukawa in MayJapan · 55 kmHigh 21.0°C · Low 11.5°C · 141 mm rain
- Nagano in MayJapan · 55 kmHigh 20.6°C · Low 9.7°C · 133 mm rain
- Maebashi in MayJapan · 57 kmHigh 21.3°C · Low 11.5°C · 141 mm rain
- Kai in MayJapan · 59 kmHigh 22.2°C · Low 12.3°C · 129 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 Saku) is explained once on the Saku year overview and on the Sources, method and limits page.