Climate averages 1991–2020
Nagano weather
in April.
A cool, wet month: the 7th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a cool month in Nagano: daytime highs average 13.9°C and nights cool to about 3.2°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 115 mm of rain on roughly 15 days, which makes April a wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 06 min on an average April day.
The nearest other city in this atlas is Ueda (29 km away). In April its highs average 15.7°C, 1.8°C warmer than Nagano, with 107 mm of rain.
Among the 303 cities listed in Japan, Nagano ranks 271st of 303 for the warmest April highs and joint 101st of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Nagano is 2.8°C cooler than that mean.
From April to May, average highs rise by 6.7°C to 20.6°C, and monthly rainfall rises from 115 mm to 133 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
Nagano climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.1°C-4.7°C | -4.7°C | 148 | 22.8 | 10.010 h |
| February | 3.2°C-4.4°C | -4.4°C | 121 | 19.1 | 10.811 h |
| March | 7.1°C-1.5°C | -1.5°C | 138 | 18.6 | 11.912 h |
| April, selected | 13.9°C3.2°C | 3.2°C | 115 | 14.6 | 13.113 h |
| May | 20.6°C9.7°C | 9.7°C | 133 | 14.7 | 14.114 h |
| June | 23.7°C14.7°C | 14.7°C | 178 | 18.1 | 14.615 h |
| July | 26.9°C19.0°C | 19.0°C | 243 | 21.7 | 14.414 h |
| August | 28.1°C19.9°C | 19.9°C | 169 | 19.5 | 13.614 h |
| September | 23.9°C15.9°C | 15.9°C | 182 | 17.0 | 12.412 h |
| October | 18.0°C9.5°C | 9.5°C | 161 | 15.6 | 11.311 h |
| November | 12.0°C3.2°C | 3.2°C | 116 | 16.4 | 10.310 h |
| December | 5.3°C-2.3°C | -2.3°C | 138 | 20.4 | 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 · 29 kmHigh 15.7°C · Low 4.3°C · 107 mm rain
- Azumino in AprilJapan · 48 kmHigh 13.8°C · Low 3.5°C · 138 mm rain
- Matsumoto in AprilJapan · 50 kmHigh 14.6°C · Low 3.6°C · 138 mm rain
- Saku in AprilJapan · 55 kmHigh 15.6°C · Low 4.8°C · 102 mm rain
- Jōetsu in AprilJapan · 56 kmHigh 15.2°C · Low 5.4°C · 97 mm rain
- Shibukawa in AprilJapan · 75 kmHigh 16.3°C · Low 6.0°C · 125 mm rain
- Takasaki in AprilJapan · 82 kmHigh 16.7°C · Low 5.7°C · 148 mm rain
- Maebashi in AprilJapan · 85 kmHigh 16.8°C · Low 6.0°C · 125 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 Nagano) is explained once on the Nagano year overview and on the Sources, method and limits page.