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Helsinki weather in September 2025
Expect 57°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Helsinki in September. Check more long-term weather averages for Helsinki 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.
Metric (°C) | Imperial (°F)
How warm is it in Helsinki in September?
Daytime temperatures usually reach 57°F in Helsinki in September, falling to 45°F at night.
How sunny is it in Helsinki in September?
There are normally 4 hours of bright sunshine each day in Helsinki in September - that's 33% of daylight hours.
How warm is the sea around Helsinki in September?
The average sea temperature around Helsinki in September is 57°F.
Does it rain in Helsinki in September?
There are usually 17 days with some rain in Helsinki in September and the average monthly rainfall is 2.9 inches.
Helsinki September sunrise & sunset times
Browse the sunrise and sunset times for Helsinki in September 2025. Select a month to view Helsinki sunrise and sunset times for the next 12 months.
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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