Climate averages 1991–2020
Saku weather
in April.
A mild, wet month: the 7th warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Saku: daytime highs average 15.6°C and nights cool to about 4.8°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 102 mm of rain on roughly 12 days, which makes April a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 05 min on an average April day.
The nearest other city in this atlas is Ueda (27 km away). In April its highs average 15.7°C, about as warm as Saku, with 107 mm of rain.
Among the 303 cities listed in Japan, Saku ranks joint 246th of 303 for the warmest April highs and 33rd of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Saku is 1.1°C cooler than that mean.
From April to May, average highs rise by 5.0°C to 20.6°C, and monthly rainfall rises from 102 mm to 131 mm.
The annual picture
April 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, selected | 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 | 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
April in nearby cities
- Ueda in AprilJapan · 27 kmHigh 15.7°C · Low 4.3°C · 107 mm rain
- Matsumoto in AprilJapan · 46 kmHigh 14.6°C · Low 3.6°C · 138 mm rain
- Takasaki in AprilJapan · 50 kmHigh 16.7°C · Low 5.7°C · 148 mm rain
- Azumino in AprilJapan · 54 kmHigh 13.8°C · Low 3.5°C · 138 mm rain
- Shibukawa in AprilJapan · 55 kmHigh 16.3°C · Low 6.0°C · 125 mm rain
- Nagano in AprilJapan · 55 kmHigh 13.9°C · Low 3.2°C · 115 mm rain
- Maebashi in AprilJapan · 57 kmHigh 16.8°C · Low 6.0°C · 125 mm rain
- Kai in AprilJapan · 59 kmHigh 17.4°C · Low 7.0°C · 120 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.