Climate averages 1991–2020
Mihara 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 Mihara: daytime highs average 27.3°C and nights cool to about 20.4°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 160 mm of rain on roughly 11 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 Onomichi (11 km away). In September its highs average 26.9°C, about as warm as Mihara, with 145 mm of rain.
Among the 303 cities listed in Japan, Mihara ranks joint 26th of 303 for the warmest September highs and joint 46th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Mihara is 1.6°C warmer than that mean.
From September to October, average highs fall by 5.5°C to 21.8°C, and monthly rainfall falls from 160 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
Mihara climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 8.7°C1.4°C | 1.4°C | 43 | 5.4 | 10.110 h |
| February | 9.8°C1.5°C | 1.5°C | 55 | 7.4 | 10.911 h |
| March | 13.3°C4.2°C | 4.2°C | 95 | 9.9 | 11.912 h |
| April | 18.4°C8.9°C | 8.9°C | 110 | 9.7 | 13.013 h |
| May | 22.9°C13.9°C | 13.9°C | 129 | 9.9 | 13.914 h |
| June | 25.9°C18.6°C | 18.6°C | 192 | 12.8 | 14.414 h |
| July | 29.3°C23.1°C | 23.1°C | 207 | 13.7 | 14.214 h |
| August | 30.9°C24.3°C | 24.3°C | 125 | 12.2 | 13.413 h |
| September, selected | 27.3°C20.4°C | 20.4°C | 160 | 11.0 | 12.412 h |
| October | 21.8°C14.2°C | 14.2°C | 103 | 7.6 | 11.311 h |
| November | 16.3°C8.5°C | 8.5°C | 59 | 6.6 | 10.410 h |
| December | 10.9°C3.6°C | 3.6°C | 50 | 5.9 | 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
- Onomichi in SeptemberJapan · 11 kmHigh 26.9°C · Low 20.3°C · 145 mm rain
- Fukuyama in SeptemberJapan · 28 kmHigh 27.3°C · Low 20.6°C · 145 mm rain
- Higashihiroshima in SeptemberJapan · 32 kmHigh 26.2°C · Low 19.3°C · 169 mm rain
- Imabari in SeptemberJapan · 37 kmHigh 26.5°C · Low 21.9°C · 196 mm rain
- Kure in SeptemberJapan · 51 kmHigh 25.5°C · Low 21.1°C · 163 mm rain
- Niihama in SeptemberJapan · 53 kmHigh 27.1°C · Low 21.4°C · 216 mm rain
- Saijō in SeptemberJapan · 55 kmHigh 27.7°C · Low 21.7°C · 216 mm rain
- Hiroshima in SeptemberJapan · 58 kmHigh 26.9°C · Low 19.9°C · 188 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 Mihara) is explained once on the Mihara year overview and on the Sources, method and limits page.