Helsinki weather in August

August in Helsinki: nice, rainy, with clean air — an excellent time to visit.

#3 of 12 months in Helsinki · #164 of 604 destinations to visit in August · comfort 86/100 (tier A)

Updated June 2026 · climate normals from ERA5 reanalysis

Helsinki climate normals — August

Daytime high20°C / 68°F😎 nice
Nighttime low14°C / 58°F
Feels like (high)19°C / 66°F
Rainfall82 mm / 3.2 in🌧 rainy
Rainy days13 days
Humidity79%💦 very humid
Dew point14°C / 58°F
Sunshine10.9 h/day
Daylight15.6 h
Wind18 km/h / 11 mph
Air quality (US AQI)38🍃 good

Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.

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Helsinki in August — FAQ

Is August a good time to visit Helsinki?
August in Helsinki: nice, rainy, with clean air — an excellent time to visit. It ranks #3 of 12 months for Helsinki on SeasonMap's comfort score (86/100).
What is the weather like in Helsinki in August?
In August, Helsinki averages a daily high of 20°C and a low of 14.4°C, with about 81.7 mm of rain over roughly 12.6 rainy days.
What is the air quality in Helsinki in August?
Helsinki has a mean US Air Quality Index of about 38 in August.

Other months in Helsinki

Warmer or cooler than Helsinki in August

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