Climate averages 1991–2020
Ōtsu weather
in August.
A hot, wet month: the warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Ōtsu: daytime highs average 30.5°C and nights cool to about 22.7°C. By daytime temperature it is the warmest month of the year.
Expect about 140 mm of rain on roughly 14 days, which makes August a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 28 min on an average August day.
The nearest other city in this atlas is Kusatsu (9 km away). In August its highs average 30.8°C, about as warm as Ōtsu, with 103 mm of rain.
Among the 303 cities listed in Japan, Ōtsu ranks joint 53rd of 303 for the warmest August highs and joint 121st of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Ōtsu is 1.3°C warmer than that mean.
From August to September, average highs fall by 4.1°C to 26.3°C, and monthly rainfall rises from 140 mm to 187 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
Ōtsu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.0°C-0.5°C | -0.5°C | 64 | 7.9 | 10.110 h |
| February | 8.0°C-0.3°C | -0.3°C | 71 | 9.0 | 10.911 h |
| March | 11.8°C2.3°C | 2.3°C | 122 | 12.4 | 11.912 h |
| April | 17.3°C7.3°C | 7.3°C | 133 | 11.7 | 13.013 h |
| May | 22.1°C12.5°C | 12.5°C | 153 | 11.6 | 14.014 h |
| June | 25.4°C17.2°C | 17.2°C | 205 | 14.6 | 14.514 h |
| July | 29.0°C21.6°C | 21.6°C | 239 | 17.6 | 14.314 h |
| August, selected | 30.5°C22.7°C | 22.7°C | 140 | 13.5 | 13.513 h |
| September | 26.3°C18.9°C | 18.9°C | 187 | 12.9 | 12.412 h |
| October | 20.6°C12.8°C | 12.8°C | 161 | 9.9 | 11.311 h |
| November | 15.0°C7.0°C | 7.0°C | 84 | 7.6 | 10.410 h |
| December | 9.5°C1.8°C | 1.8°C | 65 | 7.6 | 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
- Kusatsu in AugustJapan · 9 kmHigh 30.8°C · Low 23.1°C · 103 mm rain
- Kyoto in AugustJapan · 11 kmHigh 30.9°C · Low 23.1°C · 140 mm rain
- Moriyama in AugustJapan · 13 kmHigh 30.5°C · Low 23.0°C · 103 mm rain
- Uji in AugustJapan · 13 kmHigh 31.0°C · Low 23.3°C · 140 mm rain
- Kōtari in AugustJapan · 17 kmHigh 31.1°C · Low 23.4°C · 140 mm rain
- Jōyō in AugustJapan · 18 kmHigh 30.7°C · Low 23.1°C · 89 mm rain
- Ōmihachiman in AugustJapan · 25 kmHigh 30.2°C · Low 22.8°C · 122 mm rain
- Kameoka in AugustJapan · 26 kmHigh 30.6°C · Low 22.9°C · 145 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 Ōtsu) is explained once on the Ōtsu year overview and on the Sources, method and limits page.
Kyoto, Uji and Kōtari lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.