Climate averages 1991–2020
Izumo weather
in September.
A warm, very wet month: the 3rd warmest and the 11th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a warm month in Izumo: daytime highs average 25.0°C and nights cool to about 20.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 190 mm of rain on roughly 14 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 26 min on an average September day.
The nearest other city in this atlas is Matsue (29 km away). In September its highs average 24.7°C, about as warm as Izumo, with 184 mm of rain.
Among the 303 cities listed in Japan, Izumo ranks joint 222nd of 303 for the warmest September highs and joint 163rd of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Izumo is 0.6°C cooler than that mean.
From September to October, average highs fall by 4.8°C to 20.2°C, and monthly rainfall falls from 190 mm to 103 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
Izumo climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.5°C3.5°C | 3.5°C | 96 | 17.3 | 10.110 h |
| February | 8.2°C3.4°C | 3.4°C | 89 | 14.7 | 10.911 h |
| March | 11.3°C5.6°C | 5.6°C | 116 | 14.1 | 11.912 h |
| April | 16.0°C9.7°C | 9.7°C | 104 | 10.7 | 13.113 h |
| May | 20.3°C14.3°C | 14.3°C | 117 | 10.5 | 14.014 h |
| June | 23.7°C18.7°C | 18.7°C | 160 | 12.7 | 14.515 h |
| July | 27.2°C23.2°C | 23.2°C | 213 | 15.2 | 14.314 h |
| August | 28.7°C24.6°C | 24.6°C | 149 | 13.8 | 13.513 h |
| September, selected | 25.0°C20.9°C | 20.9°C | 190 | 13.6 | 12.412 h |
| October | 20.2°C15.8°C | 15.8°C | 103 | 10.3 | 11.311 h |
| November | 15.3°C10.7°C | 10.7°C | 87 | 11.1 | 10.310 h |
| December | 10.2°C6.0°C | 6.0°C | 103 | 16.3 | 9.810 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
- Matsue in SeptemberJapan · 29 kmHigh 24.7°C · Low 21.5°C · 184 mm rain
- Yonago in SeptemberJapan · 52 kmHigh 25.0°C · Low 20.3°C · 188 mm rain
- Higashihiroshima in SeptemberJapan · 107 kmHigh 26.2°C · Low 19.3°C · 169 mm rain
- Mihara in SeptemberJapan · 111 kmHigh 27.3°C · Low 20.4°C · 160 mm rain
- Hiroshima in SeptemberJapan · 111 kmHigh 26.9°C · Low 19.9°C · 188 mm rain
- Fukuyama in SeptemberJapan · 112 kmHigh 27.3°C · Low 20.6°C · 145 mm rain
- Onomichi in SeptemberJapan · 113 kmHigh 26.9°C · Low 20.3°C · 145 mm rain
- Tsuyama in SeptemberJapan · 117 kmHigh 26.5°C · Low 19.0°C · 181 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 Izumo) is explained once on the Izumo year overview and on the Sources, method and limits page.