Climate averages 1991–2020
Asahikawa weather
in September.
A mild, wet month: the 4th warmest and the 10th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
September is a mild month in Asahikawa: daytime highs average 19.8°C and nights cool to about 11.6°C. By daytime temperature it is the 4th warmest of the 12 months.
Expect about 142 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 33 min on an average September day.
The nearest other city in this atlas is Iwamizawa (80 km away). In September its highs average 20.8°C, 1.0°C warmer than Asahikawa, with 126 mm of rain.
Among the 303 cities listed in Japan, Asahikawa ranks 302nd of 303 for the warmest September highs and 15th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Asahikawa is 5.9°C cooler than that mean.
From September to October, average highs fall by 6.8°C to 13.0°C, and monthly rainfall falls from 142 mm to 115 mm.
The annual picture
September in context
Monthly precipitation
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
Asahikawa climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -5.2°C-12.1°C | -12.1°C | 58 | 15.1 | 9.39 h |
| February | -3.9°C-11.5°C | -11.5°C | 51 | 13.1 | 10.510 h |
| March | 0.7°C-7.2°C | -7.2°C | 67 | 14.8 | 11.912 h |
| April | 7.7°C-1.3°C | -1.3°C | 76 | 13.6 | 13.413 h |
| May | 15.9°C5.6°C | 5.6°C | 91 | 13.0 | 14.715 h |
| June | 20.4°C11.3°C | 11.3°C | 90 | 12.4 | 15.415 h |
| July | 23.9°C15.9°C | 15.9°C | 147 | 14.3 | 15.115 h |
| August | 24.1°C16.5°C | 16.5°C | 171 | 14.9 | 14.014 h |
| September, selected | 19.8°C11.6°C | 11.6°C | 142 | 14.4 | 12.613 h |
| October | 13.0°C4.6°C | 4.6°C | 115 | 15.5 | 11.111 h |
| November | 4.5°C-2.9°C | -2.9°C | 107 | 18.4 | 9.710 h |
| December | -3.0°C-10.1°C | -10.1°C | 83 | 17.3 | 9.09 h |
Precipitation (rain or snow, as water) is the average of the 30 separate monthly totals. A wet 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
- Iwamizawa in SeptemberJapan · 80 kmHigh 20.8°C · Low 13.1°C · 126 mm rain
- Ebetsu in SeptemberJapan · 99 kmHigh 20.5°C · Low 13.5°C · 138 mm rain
- Sapporo in SeptemberJapan · 113 kmHigh 20.9°C · Low 14.7°C · 155 mm rain
- Eniwa in SeptemberJapan · 117 kmHigh 20.4°C · Low 13.6°C · 138 mm rain
- Obihiro in SeptemberJapan · 117 kmHigh 20.4°C · Low 12.3°C · 165 mm rain
- Chitose in SeptemberJapan · 120 kmHigh 20.4°C · Low 14.2°C · 137 mm rain
- Kitami in SeptemberJapan · 123 kmHigh 20.0°C · Low 12.3°C · 122 mm rain
- Otaru in SeptemberJapan · 128 kmHigh 20.8°C · Low 15.3°C · 149 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 Asahikawa) is explained once on the Asahikawa year overview and on the Sources, method and limits page.