Climate averages 1991–2020
Izumisano 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 Izumisano: daytime highs average 27.8°C and nights cool to about 20.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 176 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 Kishiwada (7 km away). In September its highs average 27.0°C, 0.8°C cooler than Izumisano, with 176 mm of rain.
Among the 303 cities listed in Japan, Izumisano ranks joint 11th of 303 for the warmest September highs and joint 109th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Izumisano is 2.1°C warmer than that mean.
From September to October, average highs fall by 5.8°C to 22.0°C, and monthly rainfall falls from 176 mm to 159 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
Izumisano climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.4°C1.1°C | 1.1°C | 61 | 7.8 | 10.110 h |
| February | 9.5°C1.1°C | 1.1°C | 68 | 8.4 | 10.911 h |
| March | 13.3°C3.8°C | 3.8°C | 107 | 11.2 | 11.912 h |
| April | 18.5°C8.7°C | 8.7°C | 113 | 10.4 | 13.013 h |
| May | 23.3°C13.9°C | 13.9°C | 134 | 10.2 | 13.914 h |
| June | 26.3°C18.7°C | 18.7°C | 194 | 13.7 | 14.414 h |
| July | 29.8°C23.2°C | 23.2°C | 177 | 13.1 | 14.214 h |
| August | 31.7°C24.3°C | 24.3°C | 107 | 10.1 | 13.413 h |
| September, selected | 27.8°C20.4°C | 20.4°C | 176 | 12.3 | 12.412 h |
| October | 22.0°C14.1°C | 14.1°C | 159 | 9.8 | 11.311 h |
| November | 16.4°C8.1°C | 8.1°C | 85 | 7.9 | 10.410 h |
| December | 10.9°C3.2°C | 3.2°C | 69 | 8.2 | 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
- Kishiwada in SeptemberJapan · 7 kmHigh 27.0°C · Low 19.7°C · 176 mm rain
- Sakai in SeptemberJapan · 23 kmHigh 27.3°C · Low 20.2°C · 158 mm rain
- Kawachi-Nagano in SeptemberJapan · 25 kmHigh 26.8°C · Low 19.1°C · 158 mm rain
- Minato in SeptemberJapan · 27 kmHigh 26.5°C · Low 21.0°C · 181 mm rain
- Tondabayashichō in SeptemberJapan · 28 kmHigh 27.2°C · Low 19.5°C · 158 mm rain
- Kobe in SeptemberJapan · 33 kmHigh 27.1°C · Low 21.2°C · 191 mm rain
- Nishinomiya in SeptemberJapan · 33 kmHigh 27.4°C · Low 20.9°C · 191 mm rain
- Yao in SeptemberJapan · 34 kmHigh 27.4°C · Low 20.0°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 Izumisano) is explained once on the Izumisano year overview and on the Sources, method and limits page.
Kishiwada lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.