Helsinki climate at a glance
Helsinki sees average daytime highs ranging from -1°C in January to 21°C in July. Around 826 mm of precipitation falls over roughly 148 wet days a year, peaking in August (92 mm) and easing off in April (40 mm). June is the sunniest month at about 15 hours of sunshine. Snow is a regular feature from November to March.
Helsinki temperature & rainfall by month
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Weather seasons in Helsinki
Grouped by the monthly travel score — purely weather-based, not crowd or price data.
Helsinki climate, month by month
Averages computed from ERA5 reanalysis data, 2019–2024. Daylight on the 15th: 18.5 h in June. Reuse this data freely with attribution — download as JSON or CSV.
| Month | High | Low | Rain days | Rainfall | Sun/day | Humidity | Score |
|---|---|---|---|---|---|---|---|
| January | -1°C | -6°C | 16.2 | 78 mm | 1.5 h | 87% | 0.0 · Challenging |
| February | 0°C | -5°C | 12.3 | 70 mm | 3.5 h | 85% | 0.0 · Challenging |
| March | 2°C | -3°C | 11.3 | 52 mm | 6.7 h | 83% | 0.0 · Challenging |
| April | 7°C | 0°C | 8.7 | 40 mm | 10.1 h | 73% | 3.8 · Poor |
| May | 13°C | 6°C | 9.7 | 56 mm | 12.5 h | 69% | 6.8 · Fair |
| June | 20°C | 13°C | 8.8 | 46 mm | 15.4 h | 70% | 9.6 · Excellent |
| July | 21°C | 14°C | 13.2 | 80 mm | 13.6 h | 75% | 8.6 · Excellent |
| August | 20°C | 14°C | 13.5 | 92 mm | 11.2 h | 79% | 8.5 · Excellent |
| September | 15°C | 10°C | 11.2 | 72 mm | 8.6 h | 80% | 7.4 · Good |
| October | 10°C | 5°C | 14.3 | 88 mm | 5 h | 84% | 3.0 · Poor |
| November | 5°C | 1°C | 13.5 | 81 mm | 1.9 h | 87% | 0.0 · Challenging |
| December | 1°C | -3°C | 14.8 | 72 mm | 1.1 h | 87% | 0.0 · Challenging |
Frequently asked questions
What is the best time to visit Helsinki?
The best time to visit Helsinki is June, when daytime highs average around 20°C with about 8.8 rainy days per month.
What is the hottest month in Helsinki?
July is the hottest month in Helsinki, with average highs of 21°C.
What is the rainiest month in Helsinki?
August is the rainiest month in Helsinki, with around 92 mm of rainfall over 13.5 rainy days.
Where should you go next month?
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