Finland weather in September 2025

Expect daytime maximum temperatures of 57°F in Finland in September based on long-term weather averages. There are 4 hours of sunshine per day on average with 17 days with some rainfall and typically 2.9 inches of rainfall in the month.

  • 57°F maximum daytime temperature in September in Finland (Helsinki)57
    57°F max day temperature
  • 4 hours of sunshine per day
  • 17 days with some rainfall in September in Finland (Helsinki)17
    17 days with some rainfall
  • 45°F minimum night-time temperature in September in Finland (Helsinki)45
    45°F min night temperature
  • 13 hours of daylight per day in September in Finland (Helsinki)13
    13 hours of daylight per day
  • No heat & humidity in September in Finland (Helsinki)0
    No heat & humidity
  • 2.9 inches monthly rainfall in September in Finland (Helsinki)2.9
    2.9 inches of monthly rainfall
  • UV (maximum) index 3 (Moderate) in September in Finland (Helsinki)3
    3 (Moderate) UV index
  • 57°F sea temperature in September in Finland (Helsinki)57
    57°F sea temperature

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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)

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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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