Climate averages 1991–2020
Hakodate weather
in September.
A mild, 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 mild month in Hakodate: daytime highs average 21.3°C and nights cool to about 16.9°C. By daytime temperature it is the 3rd warmest of the 12 months.
Expect about 185 mm of rain on roughly 13 days, which makes September a very wet month (the 11th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 31 min on an average September day.
The nearest other city in this atlas is Muroran (64 km away). In September its highs average 20.2°C, 1.1°C cooler than Hakodate, with 166 mm of rain.
Among the 303 cities listed in Japan, Hakodate ranks 291st of 303 for the warmest September highs and joint 135th of 303 for the driest September (rainfall, lowest first). The mean September high of those 303 cities is 25.7°C; Hakodate is 4.4°C cooler than that mean.
From September to October, average highs fall by 6.0°C to 15.3°C, and monthly rainfall falls from 185 mm to 114 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
Hakodate climate table
| Month | Average highHigh / low | Average low | Precipitation mm/month | Wet days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | -0.5°C-5.0°C | -5.0°C | 52 | 9.2 | 9.510 h |
| February | 0.1°C-5.1°C | -5.1°C | 52 | 8.0 | 10.611 h |
| March | 3.5°C-2.2°C | -2.2°C | 66 | 9.6 | 11.912 h |
| April | 8.9°C2.4°C | 2.4°C | 83 | 9.8 | 13.313 h |
| May | 13.9°C7.7°C | 7.7°C | 119 | 11.6 | 14.515 h |
| June | 17.8°C12.6°C | 12.6°C | 121 | 11.6 | 15.215 h |
| July | 21.6°C17.3°C | 17.3°C | 178 | 14.9 | 14.915 h |
| August | 23.7°C19.7°C | 19.7°C | 206 | 14.8 | 13.914 h |
| September, selected | 21.3°C16.9°C | 16.9°C | 185 | 12.8 | 12.513 h |
| October | 15.3°C10.4°C | 10.4°C | 114 | 11.4 | 11.111 h |
| November | 8.1°C3.3°C | 3.3°C | 87 | 11.0 | 9.910 h |
| December | 2.1°C-2.2°C | -2.2°C | 70 | 10.5 | 9.29 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
- Muroran in SeptemberJapan · 64 kmHigh 20.2°C · Low 15.6°C · 166 mm rain
- Aomori in SeptemberJapan · 107 kmHigh 22.9°C · Low 15.8°C · 145 mm rain
- Tomakomai in SeptemberJapan · 119 kmHigh 20.1°C · Low 15.1°C · 177 mm rain
- Hirosaki in SeptemberJapan · 133 kmHigh 22.7°C · Low 14.9°C · 154 mm rain
- Chitose in SeptemberJapan · 138 kmHigh 20.4°C · Low 14.2°C · 137 mm rain
- Eniwa in SeptemberJapan · 142 kmHigh 20.4°C · Low 13.6°C · 138 mm rain
- Sapporo in SeptemberJapan · 152 kmHigh 20.9°C · Low 14.7°C · 155 mm rain
- Hachinohe in SeptemberJapan · 156 kmHigh 22.9°C · Low 16.0°C · 127 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 Hakodate) is explained once on the Hakodate year overview and on the Sources, method and limits page.