Helsinki weather in May

May in Helsinki: cool, a little rain, with clean air — an excellent time to visit.

#4 of 12 months in Helsinki · #336 of 604 destinations to visit in May · comfort 80/100 (tier A)

Updated June 2026 · climate normals from ERA5 reanalysis

Helsinki climate normals — May

Daytime high13°C / 55°F🙂 cool
Nighttime low6°C / 42°F
Feels like (high)10°C / 50°F
Rainfall62 mm / 2.4 in🌦 some rain
Rainy days11 days
Humidity67%💧 humid
Dew point3°C / 38°F
Sunshine12.3 h/day
Daylight17.2 h
Wind18 km/h / 11 mph
Snowfall0.5 cm / 0.2 in
Air quality (US AQI)48🍃 good

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

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Helsinki in May — FAQ

Is May a good time to visit Helsinki?
May in Helsinki: cool, a little rain, with clean air — an excellent time to visit. It ranks #4 of 12 months for Helsinki on SeasonMap's comfort score (80/100).
What is the weather like in Helsinki in May?
In May, Helsinki averages a daily high of 12.8°C and a low of 5.8°C, with about 61.9 mm of rain over roughly 11 rainy days.
What is the air quality in Helsinki in May?
Helsinki has a mean US Air Quality Index of about 48 in May.

Other months in Helsinki

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