Climate averages 1991–2020
Saku weather
in August.
A warm, wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a warm month in Saku: daytime highs average 27.8°C and nights cool to about 20.2°C. By daytime temperature it is the warmest month of the year.
Expect about 174 mm of rain on roughly 22 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 32 min on an average August day.
The nearest other city in this atlas is Ueda (27 km away). In August its highs average 28.7°C, 0.9°C warmer than Saku, with 134 mm of rain.
Among the 303 cities listed in Japan, Saku ranks joint 252nd of 303 for the warmest August highs and joint 233rd of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Saku is 1.4°C cooler than that mean.
From August to September, average highs fall by 4.1°C to 23.7°C, and monthly rainfall rises from 174 mm to 187 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Ueda in AugustJapan · 27 kmHigh 28.7°C · Low 20.2°C · 134 mm rain
- Matsumoto in AugustJapan · 46 kmHigh 28.3°C · Low 20.0°C · 155 mm rain
- Takasaki in AugustJapan · 50 kmHigh 27.8°C · Low 20.9°C · 225 mm rain
- Azumino in AugustJapan · 54 kmHigh 28.3°C · Low 20.3°C · 155 mm rain
- Shibukawa in AugustJapan · 55 kmHigh 28.2°C · Low 21.4°C · 157 mm rain
- Nagano in AugustJapan · 55 kmHigh 28.1°C · Low 19.9°C · 169 mm rain
- Maebashi in AugustJapan · 57 kmHigh 28.3°C · Low 21.3°C · 157 mm rain
- Kai in AugustJapan · 59 kmHigh 29.1°C · Low 21.5°C · 139 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.