Climate averages 1991–2020
Sanjō weather
in April.
A mild, wet month: the 7th warmest and one of the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Sanjō: daytime highs average 15.5°C and nights cool to about 4.9°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 116 mm of rain on roughly 15 days, which makes April a wet month (one of the driest months of the year). Daylight, from sunrise to sunset, lasts about 13 h 09 min on an average April day.
The nearest other city in this atlas is Tsubame (6 km away). In April its highs average 14.8°C, 0.7°C cooler than Sanjō, with 91 mm of rain.
Among the 303 cities listed in Japan, Sanjō ranks joint 249th of 303 for the warmest April highs and joint 112th of 303 for the driest April (rainfall, lowest first). The mean April high of those 303 cities is 16.7°C; Sanjō is 1.2°C cooler than that mean.
From April to May, average highs rise by 5.5°C to 21.1°C, and monthly rainfall stays at 116 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
Sanjō 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-2.0°C | -2.0°C | 206 | 25.7 | 9.910 h |
| February | 4.6°C-2.4°C | -2.4°C | 151 | 21.7 | 10.811 h |
| March | 9.0°C0.0°C | 0.0°C | 150 | 20.8 | 11.912 h |
| April, selected | 15.5°C4.9°C | 4.9°C | 116 | 15.3 | 13.113 h |
| May | 21.1°C10.6°C | 10.6°C | 116 | 13.1 | 14.214 h |
| June | 24.7°C15.8°C | 15.8°C | 143 | 14.1 | 14.715 h |
| July | 27.8°C20.4°C | 20.4°C | 244 | 17.7 | 14.514 h |
| August | 29.4°C21.8°C | 21.8°C | 169 | 15.6 | 13.614 h |
| September | 25.4°C17.9°C | 17.9°C | 156 | 15.1 | 12.512 h |
| October | 19.4°C11.5°C | 11.5°C | 157 | 15.8 | 11.311 h |
| November | 13.3°C5.6°C | 5.6°C | 153 | 18.5 | 10.210 h |
| December | 7.1°C0.6°C | 0.6°C | 202 | 24.0 | 9.610 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
- Tsubame in AprilJapan · 6 kmHigh 14.8°C · Low 5.5°C · 91 mm rain
- Nagaoka in AprilJapan · 21 kmHigh 15.7°C · Low 4.8°C · 94 mm rain
- Niigata in AprilJapan · 35 kmHigh 14.1°C · Low 6.0°C · 90 mm rain
- Kashiwazaki in AprilJapan · 45 kmHigh 15.6°C · Low 5.4°C · 104 mm rain
- Shibata in AprilJapan · 50 kmHigh 14.7°C · Low 4.8°C · 115 mm rain
- Jōetsu in AprilJapan · 82 kmHigh 15.2°C · Low 5.4°C · 97 mm rain
- Aizu-Wakamatsu in AprilJapan · 89 kmHigh 14.0°C · Low 3.8°C · 95 mm rain
- Yonezawa in AprilJapan · 108 kmHigh 13.1°C · Low 3.2°C · 115 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 Sanjō) is explained once on the Sanjō year overview and on the Sources, method and limits page.