Vaasa Weather in September
What's the weather like in Vaasa (Province of Western Finland) in September 2025?
The climate in Vaasa during September can be summarized as cool and reasonably dry.
September is in the fall / autumn in Vaasa and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 13°C (55°F), whilst at night 6°C (43°F) is normal.
| Daytime temperature | 12.6°C 54.7°F |
|---|---|
| Nightly temperature | 6.2°C 43.2°F |
| Average temperature | 9.4°C 48.9°F |
| Daily sunshine | 4 hrs |
| Avg rainfall | 61 mm 2.4 ins |
| Rainy days | 16 days |
| Sea temperature | 12.3°C 54.2°F |
| Humidity | 84% |
| Windspeed | 17.3kph 11 mph |
On average September is the 2nd wettest month of the year in Vaasa with around 61mm 2.4 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.
On the flip side this corresponds to an average of 4 hours of sunshine per day.
September temperatures in Vaasa
September rainfall
September hourly sunshine
The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Vaasa in September 2025.
Other monthly averages
Best places to visit in September
Vaasa weather stats
| Hottest month: | July | 19.6°C 67.3°F |
|---|---|---|
| Driest month: | February | 24mm 0.9ins |
| Sunniest month: | June | 0hrs |
| Coldest month: | January | -5°C 23°F |
| Wettest month: | August | 62mm 2.4ins |
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