Hakodate weather in September
Temperature, sea and sunshine in September: long-term averages from 30 years of weather data, not a forecast.
Holiday weather in September
Good
Best time to visit: June – September
What is the weather like in Hakodate in September?
In September, Hakodate is warm: daytime highs average 22 °C, and nights cool down to about 17 °C. The sea averages 22.9 °C – refreshing for a swim. Expect around 5 hours of sunshine a day. Rain is frequent, with about 12 rainy days and 154 mm in total. All in all, September is a good month for a holiday in Hakodate.
September compared
How the weather changes from August to October. Tap a month to open it.
| AugustAug | SeptemberSep | OctoberOct | |
|---|---|---|---|
| Score | 65 | 70 | 59 |
| Day | 24° | 22° | 16° |
| Night | 20° | 17° | 11° |
| Sea | 23° | 23° | 19° |
| Sun | 5 h | 5 h | 5 h |
| Rain days | 14 | 12 | 12 |
More details for September
- Daylight
- 12 h 33 min05:16 – 17:49
- UV index
- 6 · highclear sky, noon (estimate)All months
- Muggy days
- 7 daysdew point 18 °C or moreAll months
- Wind
- 19 km/haverage daily peakAll months
- Cloud cover
- 65 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 0 days1 cm or more of fresh snowAll months
- Time zone
- UTC+9Asia/Tokyo
How the score comes together
- Temperatureweight 50 %100 %
- Sunshineweight 20 %40 %
- Few rainy daysweight 30 %40 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in September
- Swimwear
- Sunscreen
- Rain jacket or umbrella
Hakodate in September: quick answers
Is Hakodate hot in September?
Warm rather than hot: in September, daytime highs in Hakodate average 22 °C and nights cool to about 17 °C.
Can you swim in Hakodate in September?
Yes. In September the sea averages 22.9 °C – refreshing for a swim.
Does it rain much in Hakodate in September?
Rain is frequent, with about 12 rainy days and 154 mm in total.
Hakodate month by month
The whole year in HakodateAll destinations: JapanWhere to go in SeptemberSea temperature in September
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences