Climate averages 1991–2020
Okayama weather
in August.
A hot, wet month: the warmest and the joint 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Okayama: daytime highs average 31.0°C and nights cool to about 24.2°C. By daytime temperature it is the warmest month of the year.
Expect about 108 mm of rain on roughly 10 days, which makes August a wet month (the joint 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 27 min on an average August day.
The nearest other city in this atlas is Kurashiki (17 km away). In August its highs average 30.7°C, about as warm as Okayama, with 95 mm of rain.
Among the 303 cities listed in Japan, Okayama ranks joint 20th of 303 for the warmest August highs and joint 25th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Okayama is 1.9°C warmer than that mean.
From August to September, average highs fall by 3.8°C to 27.2°C, and monthly rainfall rises from 108 mm to 167 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
Okayama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.8°C1.1°C | 1.1°C | 40 | 5.5 | 10.110 h |
| February | 9.8°C1.3°C | 1.3°C | 49 | 6.5 | 10.911 h |
| March | 13.3°C4.0°C | 4.0°C | 92 | 9.3 | 11.912 h |
| April | 18.4°C9.0°C | 9.0°C | 108 | 9.7 | 13.013 h |
| May | 22.9°C14.1°C | 14.1°C | 124 | 9.9 | 14.014 h |
| June | 25.9°C18.6°C | 18.6°C | 172 | 12.2 | 14.414 h |
| July | 29.6°C23.0°C | 23.0°C | 187 | 13.5 | 14.214 h |
| August, selected | 31.0°C24.2°C | 24.2°C | 108 | 10.3 | 13.513 h |
| September | 27.2°C20.2°C | 20.2°C | 167 | 10.8 | 12.412 h |
| October | 21.8°C13.8°C | 13.8°C | 114 | 7.7 | 11.311 h |
| November | 16.3°C8.0°C | 8.0°C | 57 | 6.1 | 10.410 h |
| December | 11.0°C3.1°C | 3.1°C | 46 | 5.3 | 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
- Kurashiki in AugustJapan · 17 kmHigh 30.7°C · Low 24.6°C · 95 mm rain
- Takamatsu in AugustJapan · 37 kmHigh 29.3°C · Low 24.6°C · 121 mm rain
- Marugame in AugustJapan · 43 kmHigh 29.4°C · Low 24.5°C · 106 mm rain
- Tsuyama in AugustJapan · 45 kmHigh 30.7°C · Low 23.2°C · 140 mm rain
- Fukuyama in AugustJapan · 55 kmHigh 31.0°C · Low 24.4°C · 107 mm rain
- Tatsuno in AugustJapan · 59 kmHigh 28.9°C · Low 24.1°C · 112 mm rain
- Onomichi in AugustJapan · 72 kmHigh 30.5°C · Low 24.0°C · 107 mm rain
- Himeji in AugustJapan · 72 kmHigh 29.0°C · Low 24.1°C · 114 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 Okayama) is explained once on the Okayama year overview and on the Sources, method and limits page.