Climate averages 1991–2020
Shūnan weather
in August.
A hot, wet month: the warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Shūnan: daytime highs average 28.3°C and nights cool to about 22.6°C. By daytime temperature it is the warmest month of the year.
Expect about 147 mm of rain on roughly 13 days, which makes August a wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 25 min on an average August day.
The nearest other city in this atlas is Hōfu (24 km away). In August its highs average 30.3°C, 2.1°C warmer than Shūnan, with 135 mm of rain.
Among the 303 cities listed in Japan, Shūnan ranks joint 230th of 303 for the warmest August highs and joint 153rd of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Shūnan is 0.9°C cooler than that mean.
From August to September, average highs fall by 3.2°C to 25.1°C, and monthly rainfall rises from 147 mm to 169 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
Shūnan climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.6°C0.8°C | 0.8°C | 61 | 9.3 | 10.210 h |
| February | 7.8°C0.8°C | 0.8°C | 78 | 9.7 | 10.911 h |
| March | 11.3°C3.4°C | 3.4°C | 124 | 10.7 | 12.012 h |
| April | 16.2°C7.9°C | 7.9°C | 147 | 10.2 | 13.013 h |
| May | 20.5°C12.8°C | 12.8°C | 169 | 10.1 | 13.914 h |
| June | 23.6°C17.2°C | 17.2°C | 264 | 14.3 | 14.414 h |
| July | 27.1°C21.5°C | 21.5°C | 259 | 14.6 | 14.214 h |
| August, selected | 28.3°C22.6°C | 22.6°C | 147 | 12.7 | 13.413 h |
| September | 25.1°C19.0°C | 19.0°C | 169 | 11.5 | 12.412 h |
| October | 20.1°C13.4°C | 13.4°C | 113 | 7.7 | 11.411 h |
| November | 14.5°C8.0°C | 8.0°C | 78 | 8.1 | 10.410 h |
| December | 8.9°C3.0°C | 3.0°C | 69 | 9.8 | 9.910 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
- Hōfu in AugustJapan · 24 kmHigh 30.3°C · Low 24.3°C · 135 mm rain
- Yamaguchi in AugustJapan · 35 kmHigh 30.2°C · Low 23.4°C · 167 mm rain
- Iwakuni in AugustJapan · 37 kmHigh 29.8°C · Low 24.4°C · 169 mm rain
- Ube in AugustJapan · 55 kmHigh 29.7°C · Low 24.7°C · 141 mm rain
- Hatsukaichi in AugustJapan · 55 kmHigh 30.9°C · Low 24.3°C · 169 mm rain
- Hiroshima in AugustJapan · 67 kmHigh 30.4°C · Low 23.8°C · 157 mm rain
- Kure in AugustJapan · 70 kmHigh 28.4°C · Low 24.2°C · 120 mm rain
- Nakatsu in AugustJapan · 80 kmHigh 30.9°C · Low 24.6°C · 144 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 Shūnan) is explained once on the Shūnan year overview and on the Sources, method and limits page.