Climate averages 1991–2020
Osaka weather
in September.
A warm, wet month: the 3rd warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Osaka: daytime highs average 27.6°C and nights cool to about 20.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 163 mm of rain on roughly 12 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 25 min on an average September day.
The nearest other city in this atlas is Higashiosaka (8 km away). In September its highs average 27.8°C, about as warm as Osaka, with 163 mm of rain.
Among the 303 cities listed in Japan, Osaka ranks joint 14th of 303 for the warmest September highs and joint 54th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Osaka is 1.9°C warmer than that mean.
From September to October, average highs fall by 5.9°C to 21.7°C, and monthly rainfall falls from 163 mm to 151 mm.
The annual picture
September 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 | 31.5°C24.3°C | 24.3°C | 110 | 11.6 | 13.513 h |
| September, selected | 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
September in nearby cities
- Higashiosaka in SeptemberJapan · 8 kmHigh 27.8°C · Low 20.3°C · 163 mm rain
- Toyonaka in SeptemberJapan · 10 kmHigh 27.3°C · Low 20.1°C · 163 mm rain
- Yao in SeptemberJapan · 12 kmHigh 27.4°C · Low 20.0°C · 158 mm rain
- Sakai in SeptemberJapan · 13 kmHigh 27.3°C · Low 20.2°C · 158 mm rain
- Nishinomiya in SeptemberJapan · 16 kmHigh 27.4°C · Low 20.9°C · 191 mm rain
- Takarazuka in SeptemberJapan · 18 kmHigh 27.4°C · Low 20.5°C · 191 mm rain
- Ikoma in SeptemberJapan · 18 kmHigh 26.8°C · Low 19.2°C · 140 mm rain
- Hirakata in SeptemberJapan · 19 kmHigh 27.4°C · Low 20.0°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 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.