Helsinki Weather in August
In August, Helsinki averages a high of 20°C (68°F) and a low of 13°C (56°F), from 55 years of daily records (1971–2026).
20°C
Average high
68°F
13°C
Average low
56°F
31°C
Record high
88°F · August 8, 1975
3°C
Record low
38°F · August 27, 1973
What August Is Like in Helsinki
- August in Helsinki has become 1.8°C (3.3°F) warmer on average: the 2011–2025 average against 1970–1989.
- 6 of the 10 warmest Augusts on record in Helsinki have come since 2011.
- The August heat record, 31°C (88°F) on August 8, 1975, has stood for 51 years.
- The coldest August reading, 3°C (38°F) on August 27, 1973, has not been matched in 53 years.
At least 1 mm of rain falls on 34% of August days, and the month averages 82 mm in total.
Warmest: 2002 (23.3°C)Latest: 2025 (20.1°C)10-year averageLong-run average (20.0°C)
Look Up a Day in August
See the weather in Helsinki on any August date, year by year.
Source: NOAA GHCN-Daily, Helsinki Kaisaniemi Aws (1971–2026); Helsinki Rautatientori (2009–2015). Averages cover 1971–2026. How we compute this