Helsinki weather in August 2025

Expect 20°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Helsinki in August. Check more long-term weather averages for Helsinki in August before you book your next holiday to Finland in 2025/2026.

  • 20°C maximum daytime temperature in August in Helsinki20
    20°C max day temperature
  • 7 hours of sunshine per day
  • 16 days with some rainfall in August in Helsinki16
    16 days with some rainfall
  • 11°C minimum night-time temperature in August in Helsinki11
    11°C min night temperature
  • 16 hours of daylight per day in August in Helsinki16
    16 hours of daylight per day
  • No heat & humidity in August in Helsinki0
    No heat & humidity
  • 77 mm monthly rainfall in August in Helsinki77
    77 mm of monthly rainfall
  • UV (maximum) index 4 (Moderate) in August in Helsinki4
    4 (Moderate) UV index
  • 16°C sea temperature in August in Helsinki16
    16°C sea temperature

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The August 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Helsinki in August?

Daytime temperatures usually reach 20°C in Helsinki in August, falling to 11°C at night.

How sunny is it in Helsinki in August?

There are normally 7 hours of bright sunshine each day in Helsinki in August - that's 42% of daylight hours.

How warm is the sea around Helsinki in August?

The average sea temperature around Helsinki in August is 16°C.

Does it rain in Helsinki in August?

There are usually 16 days with some rain in Helsinki in August and the average monthly rainfall is 77mm.

Helsinki August sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st August 2025 04:00 20:51
Saturday, 16th August 2025 04:36 20:11
Sunday, 31st August 2025 05:12 19:27

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