Climate averages 1991–2020
Nagano weather
in May.
A mild, wet month: the 5th warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a mild month in Nagano: daytime highs average 20.6°C and nights cool to about 9.7°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 133 mm of rain on roughly 15 days, which makes May a wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 06 min on an average May day.
The nearest other city in this atlas is Ueda (29 km away). In May its highs average 21.1°C, about as warm as Nagano, with 123 mm of rain.
Among the 303 cities listed in Japan, Nagano ranks joint 230th of 303 for the warmest May highs and joint 109th of 303 for the driest May (rainfall, lowest first). The mean May high of those 303 cities is 21.3°C; Nagano is 0.7°C cooler than that mean.
From May to June, average highs rise by 3.1°C to 23.7°C, and monthly rainfall rises from 133 mm to 178 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
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 | 13.9°C3.2°C | 3.2°C | 115 | 14.6 | 13.113 h |
| May, selected | 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
May in nearby cities
- Ueda in MayJapan · 29 kmHigh 21.1°C · Low 10.2°C · 123 mm rain
- Azumino in MayJapan · 48 kmHigh 20.6°C · Low 9.9°C · 156 mm rain
- Matsumoto in MayJapan · 50 kmHigh 20.7°C · Low 9.8°C · 156 mm rain
- Saku in MayJapan · 55 kmHigh 20.6°C · Low 10.6°C · 131 mm rain
- Jōetsu in MayJapan · 56 kmHigh 21.0°C · Low 11.5°C · 92 mm rain
- Shibukawa in MayJapan · 75 kmHigh 21.0°C · Low 11.5°C · 141 mm rain
- Takasaki in MayJapan · 82 kmHigh 21.0°C · Low 11.1°C · 178 mm rain
- Maebashi in MayJapan · 85 kmHigh 21.3°C · Low 11.5°C · 141 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.