Helsinki, Finland — Climate
Helsinki Weather
Helsinki has a climate that is transitional between maritime and continental. Summers are warm and bright, temperatures ranging from a cool 59°F (15°C) up to a hot 86°F (30°C) in the warmest month of July. Days are long and sunny, with up to 19 hours of daylight. Towards the end of September temperatures cool down drastically as days grow shorter, and by November the weather is at freezing point as the cold, snowy winter sets in. The city is blanketed by snow in winter, temperatures plummeting well below freezing to the point where the sea itself freezes over, and it is never fully daylight. Spring arrives late, in early April.
Average Temperatures and Rainfall in Helsinki
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rainfall (inches) | 1.8 | 1.4 | 1.4 | 1.5 | 1.7 | 1.8 | 2.4 | 2.9 | 2.6 | 2.7 | 2.6 | 2.2 |
| Rainfall (cm) | 46 | 37 | 35 | 37 | 42 | 46 | 61 | 75 | 66 | 68 | 66 | 55 |
| Ave Temp (°C) | -6 °C | -6 °C | -6 °C | 2 °C | 8 °C | 14 °C | 17 °C | 15 °C | 11 °C | 5 °C | 0 °C | -3 °C |
| Min Temp (°C) | -9 °C | -9 °C | -6 °C | 0 °C | 4 °C | 9 °C | 12 °C | 11 °C | 6 °C | 2 °C | -5 °C | -7 °C |
| Max Temp (°C) | -3 °C | -3 °C | 1 °C | 7 °C | 15 °C | 20 °C | 22 °C | 20 °C | 14 °C | 8 °C | 2 °C | -0.8 °C |
| Ave Temp (°F) | 21 °F | 20 °F | 26 °F | 35 °F | 47 °F | 57 °F | 62 °F | 60 °F | 51 °F | 42 °F | 33 °F | 26 °F |
| Min Temp (°F) | 17 °F | 15 °F | 22 °F | 31 °F | 40 °F | 49 °F | 53 °F | 51 °F | 43 °F | 36 °F | 28 °F | 20 °F |
| Max Temp (°F) | 27 °F | 27 °F | 34 °F | 45 °F | 60 °F | 68 °F | 71 °F | 68 °F | 57 °F | 47 °F | 36 °F | 31 °F |
| Good Weather | No | No | No | No | No | Yes | Yes | Yes | No | No | No | No |
