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Finland weather in September 2025
Expect 57°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Finland in September. Check more long-term weather averages for Finland in September before you book your next holiday to Finland in 2025/2026.
- 5757°F max day temperature
- 4 hours of sunshine per day
- 1717 days with some rainfall
- 4545°F min night temperature
- 1313 hours of daylight per day
- 0No heat & humidity
- 2.92.9 inches of monthly rainfall
- 33 (Moderate) UV index
- 5757°F sea temperature
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Recommended for Finland
The September weather guide for Finland (Helsinki) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Top Finland destinations
Below are average maximum temperatures at popular countries, regions and places in Finland in September. Select a holiday destination to see more weather parameters.
All Finland destinations
Metric (°C) | Imperial (°F)
How warm is it in Finland in September?
Daytime temperatures usually reach 57°F in Helsinki, Finland in September, falling to 45°F at night.
How sunny is it in Finland in September?
There are normally 4 hours of bright sunshine each day in Helsinki, Finland in September - that's 33% of daylight hours.
How warm is the sea around Finland in September?
The average sea temperature around Helsinki, Finland in September is 57°F.
Does it rain in Finland in September?
There are usually 17 days with some rain in Helsinki, Finland in September and the average monthly rainfall is 2.9 inches.
Finland September sunrise & sunset times
Browse the sunrise and sunset times for Finland in September 2025. Select a month to view Finland sunrise and sunset times for the next 12 months. The Finland sunrise and sunset times shown below are for Helsinki.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:15 | 19:24 |
Monday, 15th September 2025 | 05:48 | 18:41 |
Tuesday, 30th September 2025 | 06:24 | 17:55 |
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