Historical Weather in Helsinki, Finland
See 55+ years of weather history for any date in Helsinki going back to 1970.
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Monthly Climate Averages
Historical temperature and precipitation averages for Helsinki, Finland, based on 55+ years of weather data.
Temperatures shown in Celsius with Fahrenheit in parentheses. Rainfall in millimetres, snowfall in centimetres.
Helsinki Weather by Month
January in Helsinki has become 1.9°C (3.5°F) warmer on average: the 2012–2026 average against 1970–1989.
February in Helsinki has become 3.3°C (5.9°F) warmer on average: the 2012–2026 average against 1970–1989.
March in Helsinki has become 2.9°C (5.3°F) warmer on average: the 2012–2026 average against 1970–1989.
April in Helsinki has become 2.0°C (3.6°F) warmer on average: the 2012–2026 average against 1970–1989.
6 of the 10 warmest Mays on record in Helsinki have come since 2012.
The June heat record, 31°C (87°F) on June 28, 1972, has stood for 54 years.
The coldest July reading, 7°C (45°F) on July 17, 1987, has not been matched in 39 years.
August in Helsinki has become 1.8°C (3.2°F) warmer on average: the 2012–2026 average against 1970–1989.
Helsinki's hottest September day on record is a recent one: 25°C (78°F) on September 5, 2024.
5 of the 10 warmest Octobers on record in Helsinki have come since 2011.
November in Helsinki has become 2.4°C (4.3°F) warmer on average: the 2011–2025 average against 1970–1989.
December in Helsinki has become 3.0°C (5.3°F) warmer on average: the 2011–2025 average against 1970–1989.
Source: NOAA GHCN-Daily, Helsinki Kaisaniemi Aws (1971–2026); Helsinki Rautatientori (2009–2015). Records through 2026.