Climate averages 1991–2020
Osaka weather
in August.
A hot, wet month: the warmest and the joint 5th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in Osaka: daytime highs average 31.5°C and nights cool to about 24.3°C. By daytime temperature it is the warmest month of the year.
Expect about 110 mm of rain on roughly 12 days, which makes August a wet month (the joint 5th 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 Higashiosaka (8 km away). In August its highs average 31.8°C, about as warm as Osaka, with 110 mm of rain.
Among the 303 cities listed in Japan, Osaka ranks 3rd of 303 for the warmest August highs and joint 27th of 303 for the driest August (rainfall, lowest first). The mean August high of those 303 cities is 29.2°C; Osaka is 2.3°C warmer than that mean.
From August to September, average highs fall by 3.9°C to 27.6°C, and monthly rainfall rises from 110 mm to 163 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
Osaka climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.2°C1.1°C | 1.1°C | 57 | 5.9 | 10.110 h |
| February | 9.2°C1.1°C | 1.1°C | 65 | 7.4 | 10.911 h |
| March | 12.8°C3.8°C | 3.8°C | 110 | 10.7 | 11.912 h |
| April | 18.2°C8.8°C | 8.8°C | 118 | 10.4 | 13.013 h |
| May | 23.0°C14.1°C | 14.1°C | 139 | 10.6 | 14.014 h |
| June | 26.2°C18.8°C | 18.8°C | 189 | 13.0 | 14.414 h |
| July | 29.7°C23.1°C | 23.1°C | 183 | 14.6 | 14.214 h |
| August, selected | 31.5°C24.3°C | 24.3°C | 110 | 11.6 | 13.513 h |
| September | 27.6°C20.4°C | 20.4°C | 163 | 11.9 | 12.412 h |
| October | 21.7°C14.3°C | 14.3°C | 151 | 9.5 | 11.311 h |
| November | 16.1°C8.5°C | 8.5°C | 81 | 7.2 | 10.410 h |
| December | 10.6°C3.4°C | 3.4°C | 62 | 6.8 | 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
- Higashiosaka in AugustJapan · 8 kmHigh 31.8°C · Low 24.2°C · 110 mm rain
- Toyonaka in AugustJapan · 10 kmHigh 31.2°C · Low 24.0°C · 110 mm rain
- Yao in AugustJapan · 12 kmHigh 31.4°C · Low 23.9°C · 100 mm rain
- Sakai in AugustJapan · 13 kmHigh 31.2°C · Low 24.0°C · 100 mm rain
- Nishinomiya in AugustJapan · 16 kmHigh 31.1°C · Low 24.7°C · 131 mm rain
- Takarazuka in AugustJapan · 18 kmHigh 31.3°C · Low 24.4°C · 131 mm rain
- Ikoma in AugustJapan · 18 kmHigh 30.8°C · Low 23.1°C · 89 mm rain
- Hirakata in AugustJapan · 19 kmHigh 31.3°C · Low 23.9°C · 89 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 Osaka) is explained once on the Osaka year overview and on the Sources, method and limits page.
Higashiosaka and Toyonaka lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.