Climate averages 1991–2020
Sanjō weather
in August.
A hot, wet month: the warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Sanjō: daytime highs average 29.4°C and nights cool to about 21.8°C. By daytime temperature it is the warmest month of the year.
Expect about 169 mm of rain on roughly 16 days, which makes August a wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 37 min on an average August day.
The nearest other city in this atlas is Tsubame (6 km away). In August its highs average 28.8°C, 0.6°C cooler than Sanjō, with 149 mm of rain.
Among the 303 cities listed in Japan, Sanjō ranks joint 168th of 303 for the warmest August highs and joint 214th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Sanjō is 0.3°C warmer than that mean.
From August to September, average highs fall by 4.0°C to 25.4°C, and monthly rainfall falls from 169 mm to 156 mm.
The annual picture
August 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 | 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, selected | 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
August in nearby cities
- Tsubame in AugustJapan · 6 kmHigh 28.8°C · Low 22.3°C · 149 mm rain
- Nagaoka in AugustJapan · 21 kmHigh 29.8°C · Low 21.6°C · 146 mm rain
- Niigata in AugustJapan · 35 kmHigh 28.3°C · Low 22.7°C · 159 mm rain
- Kashiwazaki in AugustJapan · 45 kmHigh 29.6°C · Low 22.0°C · 145 mm rain
- Shibata in AugustJapan · 50 kmHigh 28.6°C · Low 21.7°C · 194 mm rain
- Jōetsu in AugustJapan · 82 kmHigh 29.3°C · Low 22.2°C · 122 mm rain
- Aizu-Wakamatsu in AugustJapan · 89 kmHigh 27.8°C · Low 20.6°C · 132 mm rain
- Yonezawa in AugustJapan · 108 kmHigh 27.7°C · Low 20.6°C · 183 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.