Climate averages 1991–2020
Ōshū 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 Ōshū: daytime highs average 23.2°C and nights cool to about 16.1°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 151 mm of rain on roughly 14 days, which makes September a wet month (the 10th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 29 min on an average September day.
The nearest other city in this atlas is Kitakami (17 km away). In September its highs average 22.6°C, 0.7°C cooler than Ōshū, with 154 mm of rain.
Among the 303 cities listed in Japan, Ōshū ranks 278th of 303 for the warmest September highs and joint 26th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Ōshū is 2.4°C cooler than that mean.
From September to October, average highs fall by 5.7°C to 17.5°C, and monthly rainfall falls from 151 mm to 120 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
Ōshū climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.0°C-5.5°C | -5.5°C | 59 | 10.8 | 9.810 h |
| February | 3.0°C-5.4°C | -5.4°C | 53 | 10.2 | 10.711 h |
| March | 7.5°C-1.8°C | -1.8°C | 92 | 13.2 | 11.912 h |
| April | 14.1°C3.6°C | 3.6°C | 98 | 13.4 | 13.213 h |
| May | 19.3°C9.3°C | 9.3°C | 110 | 12.4 | 14.314 h |
| June | 22.5°C14.1°C | 14.1°C | 123 | 12.9 | 14.915 h |
| July | 25.7°C18.6°C | 18.6°C | 166 | 16.4 | 14.615 h |
| August | 27.0°C19.9°C | 19.9°C | 153 | 15.2 | 13.714 h |
| September, selected | 23.2°C16.1°C | 16.1°C | 151 | 13.5 | 12.512 h |
| October | 17.5°C9.3°C | 9.3°C | 120 | 11.2 | 11.211 h |
| November | 11.3°C3.0°C | 3.0°C | 73 | 11.7 | 10.110 h |
| December | 4.9°C-1.9°C | -1.9°C | 68 | 12.4 | 9.59 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
- Kitakami in SeptemberJapan · 17 kmHigh 22.6°C · Low 15.3°C · 154 mm rain
- Ichinoseki in SeptemberJapan · 25 kmHigh 23.3°C · Low 16.1°C · 149 mm rain
- Hanamaki in SeptemberJapan · 28 kmHigh 22.5°C · Low 15.3°C · 147 mm rain
- Tome in SeptemberJapan · 48 kmHigh 23.6°C · Low 17.0°C · 145 mm rain
- Yokote in SeptemberJapan · 57 kmHigh 23.1°C · Low 15.8°C · 156 mm rain
- Morioka in SeptemberJapan · 62 kmHigh 21.9°C · Low 14.8°C · 137 mm rain
- Ōsaki in SeptemberJapan · 64 kmHigh 23.6°C · Low 16.7°C · 168 mm rain
- Daisen in SeptemberJapan · 67 kmHigh 23.3°C · Low 15.8°C · 152 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 Ōshū) is explained once on the Ōshū year overview and on the Sources, method and limits page.