Helsinki Weather in May
In May, Helsinki averages a high of 14°C (58°F) and a low of 7°C (44°F), from 56 years of daily records (1971–2026).
14°C
Average high
58°F
7°C
Average low
44°F
28°C
Record high
82°F · May 15, 2018
-3°C
Record low
26°F · May 3, 1999
What May Is Like in Helsinki
- 6 of the 10 warmest Mays on record in Helsinki have come since 2012.
- May in Helsinki has become 1.2°C (2.2°F) warmer on average: the 2012–2026 average against 1970–1989.
- On average, 0.8 nights in May drop below freezing.
- The warmest May in the record was 2018; the coldest was 1974.
At least 1 mm of rain falls on 21% of May days, and the month averages 35 mm in total.
Warmest: 2018 (19.1°C)Latest: 2026 (16.2°C)10-year averageLong-run average (14.5°C)
Look Up a Day in May
See the weather in Helsinki on any May 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