Climate averages 1991–2020
Kōriyama weather
in September.
A warm, 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 Kōriyama: daytime highs average 23.7°C and nights cool to about 16.8°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 151 mm of rain on roughly 13 days, which makes September a wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 28 min on an average September day.
The nearest other city in this atlas is Sukagawa (13 km away). In September its highs average 23.7°C, about as warm as Kōriyama, with 171 mm of rain.
Among the 303 cities listed in Japan, Kōriyama ranks joint 266th 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; Kōriyama is 2.0°C cooler than that mean.
From September to October, average highs fall by 5.8°C to 17.9°C, and monthly rainfall falls from 151 mm to 136 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
Kōriyama climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 3.2°C-3.7°C | -3.7°C | 57 | 9.2 | 9.910 h |
| February | 4.2°C-3.6°C | -3.6°C | 48 | 8.4 | 10.811 h |
| March | 8.4°C-0.7°C | -0.7°C | 86 | 11.2 | 11.912 h |
| April | 14.9°C4.5°C | 4.5°C | 95 | 11.5 | 13.113 h |
| May | 20.1°C10.1°C | 10.1°C | 97 | 11.5 | 14.214 h |
| June | 23.4°C15.0°C | 15.0°C | 112 | 13.1 | 14.715 h |
| July | 26.6°C19.3°C | 19.3°C | 173 | 17.3 | 14.514 h |
| August | 27.8°C20.6°C | 20.6°C | 130 | 14.6 | 13.614 h |
| September, selected | 23.7°C16.8°C | 16.8°C | 151 | 13.2 | 12.512 h |
| October | 17.9°C10.5°C | 10.5°C | 136 | 10.8 | 11.311 h |
| November | 12.1°C4.2°C | 4.2°C | 66 | 8.1 | 10.210 h |
| December | 6.2°C-0.6°C | -0.6°C | 49 | 9.3 | 9.610 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
- Sukagawa in SeptemberJapan · 13 kmHigh 23.7°C · Low 16.8°C · 171 mm rain
- Fukushima in SeptemberJapan · 40 kmHigh 24.1°C · Low 16.9°C · 169 mm rain
- Aizu-Wakamatsu in SeptemberJapan · 40 kmHigh 23.5°C · Low 16.9°C · 144 mm rain
- Nasushiobara in SeptemberJapan · 55 kmHigh 23.8°C · Low 17.0°C · 227 mm rain
- Iwaki in SeptemberJapan · 59 kmHigh 24.5°C · Low 19.4°C · 192 mm rain
- Yonezawa in SeptemberJapan · 61 kmHigh 23.6°C · Low 16.7°C · 155 mm rain
- Ōtawara in SeptemberJapan · 67 kmHigh 24.0°C · Low 17.0°C · 193 mm rain
- Hitachi in SeptemberJapan · 92 kmHigh 24.7°C · Low 20.1°C · 174 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 Kōriyama) is explained once on the Kōriyama year overview and on the Sources, method and limits page.