Climate averages 1991–2020
Ōmihachiman weather
in August.
A hot, wet month: the warmest and the 6th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Ōmihachiman: daytime highs average 30.2°C and nights cool to about 22.8°C. By daytime temperature it is the warmest month of the year.
Expect about 122 mm of rain on roughly 12 days, which makes August a wet month (the 6th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 29 min on an average August day.
The nearest other city in this atlas is Youkaichi (9 km away). In August its highs average 30.1°C, about as warm as Ōmihachiman, with 148 mm of rain.
Among the 303 cities listed in Japan, Ōmihachiman ranks joint 78th of 303 for the warmest August highs and joint 75th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Ōmihachiman is 1.1°C warmer than that mean.
From August to September, average highs fall by 4.1°C to 26.2°C, and monthly rainfall rises from 122 mm to 179 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
Ōmihachiman climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.1°C0.0°C | 0.0°C | 81 | 13.9 | 10.110 h |
| February | 8.0°C0.0°C | 0.0°C | 78 | 13.0 | 10.911 h |
| March | 11.8°C2.6°C | 2.6°C | 116 | 13.5 | 11.912 h |
| April | 17.2°C7.4°C | 7.4°C | 123 | 11.6 | 13.113 h |
| May | 21.9°C12.6°C | 12.6°C | 148 | 11.6 | 14.014 h |
| June | 25.3°C17.3°C | 17.3°C | 186 | 14.0 | 14.514 h |
| July | 28.9°C21.8°C | 21.8°C | 210 | 15.9 | 14.314 h |
| August, selected | 30.2°C22.8°C | 22.8°C | 122 | 12.3 | 13.513 h |
| September | 26.2°C19.1°C | 19.1°C | 179 | 12.3 | 12.412 h |
| October | 20.5°C13.2°C | 13.2°C | 152 | 10.8 | 11.311 h |
| November | 15.1°C7.5°C | 7.5°C | 81 | 9.0 | 10.410 h |
| December | 9.6°C2.4°C | 2.4°C | 75 | 11.6 | 9.810 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
- Youkaichi in AugustJapan · 9 kmHigh 30.1°C · Low 22.9°C · 148 mm rain
- Moriyama in AugustJapan · 12 kmHigh 30.5°C · Low 23.0°C · 103 mm rain
- Kusatsu in AugustJapan · 17 kmHigh 30.8°C · Low 23.1°C · 103 mm rain
- Kōka in AugustJapan · 17 kmHigh 30.2°C · Low 22.8°C · 148 mm rain
- Hikone in AugustJapan · 19 kmHigh 29.7°C · Low 23.1°C · 163 mm rain
- Ōtsu in AugustJapan · 25 kmHigh 30.5°C · Low 22.7°C · 140 mm rain
- Nagahama in AugustJapan · 32 kmHigh 29.7°C · Low 23.1°C · 173 mm rain
- Kyoto in AugustJapan · 33 kmHigh 30.9°C · Low 23.1°C · 140 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 Ōmihachiman) is explained once on the Ōmihachiman year overview and on the Sources, method and limits page.