What is the weather like in Helsinki in summer?
Daytime temperatures, cool evenings and the warmest time of the year.
Short answer
Helsinki summers are mild and bright. Visit Finland gives typical summer temperatures of 18 to 25 °C. The warmest time is around 20 July, and in July 2026 the average temperature on the south coast was about 17 to 18 °C. Evenings by the sea can be cool, and rain showers come and go.
Why
- Visit Finland gives Helsinki summer temperatures of 18 to 25 °C.
- The Finnish Meteorological Institute says the warmest day of the year is usually around 20 July.
- In July 2026 the monthly mean on the south coast was about 17 to 18 °C, according to FMI.
Details
June evenings can drop to 10 to 15 °C, so a sweater is useful even in midsummer. Sea water is often still cold in June and warmest in late July and August.
Tip
Pack a light rain jacket and sunglasses. The sun is low and bright late into the evening.
What may differ
Inland cities such as Tampere and Lahti can be a few degrees warmer on sunny days than the coast.
Common misconception
Helsinki summer is too cold for swimming.
What actually happens
Locals swim in the sea and lakes all summer, especially in July and August.
People also ask
- Is July a good time to visit Helsinki?
- How warm is Helsinki in June?
- Does it rain a lot in Helsinki in summer?
Sources
This answer is for reference only. Weather varies a lot from year to year, so check the forecast of the Finnish Meteorological Institute before you travel.
Weather & SeasonsRelated questions
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When does the snow melt in Finland?
Visit Finland says snow melts first on the southern coast, while Lapland keeps its snow into May.
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When does autumn start in Finland?
The Finnish Meteorological Institute says autumn begins when the daily mean temperature stays below 10 °C.
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What is the weather like in Helsinki in winter?
Visit Finland gives typical winter temperatures of -3 to -8 °C in Helsinki.
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When is the best time for skiing in Lapland?
Late winter and spring are the best time.