Vaasa weather in September 2025

Expect daytime maximum temperatures of 55°F in Vaasa, Finland in September based on long-term weather averages. There are 3 hours of sunshine per day on average with 16 days with some rainfall and typically 2.4 inches of rainfall in the month.

  • 55°F maximum daytime temperature in September in Vaasa55
    55°F max day temperature
  • 3 hours of sunshine per day
  • 16 days with some rainfall in September in Vaasa16
    16 days with some rainfall
  • 43°F minimum night-time temperature in September in Vaasa43
    43°F min night temperature
  • 13 hours of daylight per day in September in Vaasa13
    13 hours of daylight per day
  • No heat & humidity in September in Vaasa0
    No heat & humidity
  • 2.4 inches monthly rainfall in September in Vaasa2.4
    2.4 inches of monthly rainfall
  • UV (maximum) index 2 (Low) in September in Vaasa2
    2 (Low) UV index
  • 54°F sea temperature in September in Vaasa54
    54°F sea temperature

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The September weather guide for Finland (Vaasa) 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)

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How warm is it in Vaasa in September?

Daytime temperatures usually reach 55°F in Vaasa in September, falling to 43°F at night.

How sunny is it in Vaasa in September?

There are normally 3 hours of bright sunshine each day in Vaasa in September - that's 26% of daylight hours.

How warm is the sea around Vaasa in September?

The average sea temperature around Vaasa in September is 54°F.

Does it rain in Vaasa in September?

There are usually 16 days with some rain in Vaasa in September and the average monthly rainfall is 2.4 inches.

Vaasa September sunrise & sunset times

Browse the sunrise and sunset times for Vaasa in September 2025. Select a month to view Vaasa sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:20 19:45
Monday, 15th September 2025 05:58 18:58
Tuesday, 30th September 2025 06:39 18:06

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