Finland climate
Monthly averages for Helsinki, 2021–2025
In Helsinki, the warmest month is July, with an average high of 22°C, and the coldest is February, when nights average −6°C.
About 803 mm of rain falls in a year, on roughly 145 days. August is the wettest month (101 mm) and March the driest (42 mm).
Wind is strongest in January (19 km/h on average) and lightest in June (14 km/h).
Compared with Dublin, July afternoons are 2°C warmer, and January afternoons 9°C colder.
The hottest day in 2021–2025 reached 30.1°C (10 July 2021), and the coldest night fell to −25.8°C (7 January 2024).
Temperature
Bars run from the average night-time low to the average daytime high, in °C.
Rainfall
Average total rainfall each month, in millimetres.
Wind
Average wind speed at 10 metres each month, in km/h.
| Month | High °C | Low °C | Rain mm | Rain days | Sun h/day | Wind km/h |
|---|---|---|---|---|---|---|
| January | −1 | −6 | 81 | 16 | 1.4 | 19 |
| February | −1 | −6 | 56 | 10 | 3.1 | 16 |
| March | 2 | −4 | 42 | 9 | 6.8 | 16 |
| April | 7 | 0 | 51 | 10 | 9.8 | 16 |
| May | 14 | 6 | 50 | 9 | 12.6 | 14 |
| June | 20 | 12 | 53 | 11 | 14.9 | 14 |
| July | 22 | 15 | 72 | 13 | 14.0 | 14 |
| August | 20 | 14 | 101 | 15 | 11.2 | 15 |
| September | 16 | 10 | 73 | 10 | 8.7 | 15 |
| October | 10 | 5 | 83 | 13 | 5.0 | 19 |
| November | 5 | 1 | 72 | 14 | 1.9 | 17 |
| December | 0 | −4 | 69 | 14 | 1.2 | 17 |
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