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

More about Helsinki

Helsinki by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Finland

  • Save up to £175 on skiing holidays in winter 2024/2025
  • £175 off bookings to Austria, France & Italy
  • Othewise £100 discount. Depart Dec 2024-Apr 2025
Show discount codeShow discount code ******STE

Expires at 23:59 on Thursday 31st Oct 2024 · View all Crystal Ski offers

Crystal Ski HolidaysCrystal Ski deal finder

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^