Climate averages 1991–2020
Jōetsu weather
in April.
A mild, wet month: the 7th warmest and the 2nd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Jōetsu: daytime highs average 15.2°C and nights cool to about 5.4°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 97 mm of rain on roughly 13 days, which makes April a wet month (the 2nd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 07 min on an average April day.
The nearest other city in this atlas is Kashiwazaki (37 km away). In April its highs average 15.6°C, about as warm as Jōetsu, with 104 mm of rain.
Among the 303 cities listed in Japan, Jōetsu ranks joint 257th of 303 for the warmest April highs and joint 27th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Jōetsu is 1.5°C cooler than that mean.
From April to May, average highs rise by 5.8°C to 21.0°C, and monthly rainfall falls from 97 mm to 92 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
Jōetsu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.1°C-1.1°C | -1.1°C | 254 | 26.0 | 9.910 h |
| February | 4.6°C-1.3°C | -1.3°C | 179 | 21.4 | 10.811 h |
| March | 8.3°C0.6°C | 0.6°C | 145 | 19.6 | 11.912 h |
| April, selected | 15.2°C5.4°C | 5.4°C | 97 | 13.4 | 13.113 h |
| May | 21.0°C11.5°C | 11.5°C | 92 | 11.6 | 14.114 h |
| June | 24.4°C16.4°C | 16.4°C | 115 | 11.5 | 14.715 h |
| July | 27.8°C20.9°C | 20.9°C | 191 | 14.4 | 14.414 h |
| August | 29.3°C22.2°C | 22.2°C | 122 | 12.1 | 13.614 h |
| September | 25.2°C18.4°C | 18.4°C | 162 | 14.1 | 12.512 h |
| October | 19.6°C12.4°C | 12.4°C | 164 | 15.1 | 11.311 h |
| November | 13.7°C6.4°C | 6.4°C | 180 | 18.5 | 10.210 h |
| December | 7.4°C1.2°C | 1.2°C | 247 | 24.2 | 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
- Kashiwazaki in AprilJapan · 37 kmHigh 15.6°C · Low 5.4°C · 104 mm rain
- Nagano in AprilJapan · 56 kmHigh 13.9°C · Low 3.2°C · 115 mm rain
- Nagaoka in AprilJapan · 64 kmHigh 15.7°C · Low 4.8°C · 94 mm rain
- Sanjō in AprilJapan · 82 kmHigh 15.5°C · Low 4.9°C · 116 mm rain
- Ueda in AprilJapan · 83 kmHigh 15.7°C · Low 4.3°C · 107 mm rain
- Tsubame in AprilJapan · 84 kmHigh 14.8°C · Low 5.5°C · 91 mm rain
- Shibukawa in AprilJapan · 100 kmHigh 16.3°C · Low 6.0°C · 125 mm rain
- Azumino in AprilJapan · 101 kmHigh 13.8°C · Low 3.5°C · 138 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 Jōetsu) is explained once on the Jōetsu year overview and on the Sources, method and limits page.