Climate averages 1991–2020
Yao 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 Yao: daytime highs average 27.4°C and nights cool to about 20.0°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 158 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 (6 km away). In September its highs average 27.8°C, about as warm as Yao, with 163 mm of rain.
Among the 303 cities listed in Japan, Yao ranks joint 19th of 303 for the warmest September highs and joint 42nd of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Yao is 1.7°C warmer than that mean.
From September to October, average highs fall by 6.0°C to 21.4°C, and monthly rainfall falls from 158 mm to 156 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
Yao climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.8°C0.5°C | 0.5°C | 64 | 8.2 | 10.110 h |
| February | 8.9°C0.6°C | 0.6°C | 71 | 8.8 | 10.911 h |
| March | 12.7°C3.2°C | 3.2°C | 112 | 11.6 | 11.912 h |
| April | 18.0°C8.2°C | 8.2°C | 114 | 10.4 | 13.013 h |
| May | 22.9°C13.5°C | 13.5°C | 132 | 10.4 | 14.014 h |
| June | 26.1°C18.3°C | 18.3°C | 198 | 13.6 | 14.414 h |
| July | 29.6°C22.7°C | 22.7°C | 172 | 13.8 | 14.214 h |
| August | 31.4°C23.9°C | 23.9°C | 100 | 10.3 | 13.513 h |
| September, selected | 27.4°C20.0°C | 20.0°C | 158 | 11.8 | 12.412 h |
| October | 21.4°C13.7°C | 13.7°C | 156 | 10.0 | 11.311 h |
| November | 15.8°C7.6°C | 7.6°C | 84 | 8.0 | 10.410 h |
| December | 10.2°C2.6°C | 2.6°C | 68 | 8.4 | 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 · 6 kmHigh 27.8°C · Low 20.3°C · 163 mm rain
- Ikoma in SeptemberJapan · 12 kmHigh 26.8°C · Low 19.2°C · 140 mm rain
- Osaka in SeptemberJapan · 12 kmHigh 27.6°C · Low 20.4°C · 163 mm rain
- Sakai in SeptemberJapan · 13 kmHigh 27.3°C · Low 20.2°C · 158 mm rain
- Tondabayashichō in SeptemberJapan · 13 kmHigh 27.2°C · Low 19.5°C · 158 mm rain
- Kashiba in SeptemberJapan · 14 kmHigh 27.3°C · Low 19.4°C · 173 mm rain
- Yamatokōriyama in SeptemberJapan · 16 kmHigh 27.2°C · Low 19.7°C · 173 mm rain
- Kawachi-Nagano in SeptemberJapan · 20 kmHigh 26.8°C · Low 19.1°C · 158 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 Yao) is explained once on the Yao year overview and on the Sources, method and limits page.
Sakai, Tondabayashichō and Kawachi-Nagano lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.