Helsinki weather in December
December is one of the least pleasant months in Helsinki: highs of 1°C (34°F) and about 67 mm (2.6 in) of rain on average. Nights average -1°C (29°F) and cloud cover 85% (NASA POWER, 2001–2025 averages). It is the 4th wettest month of the year and the 4th coolest. Compared with November, it is cooler and about as wet; January brings highs of -1°C (29°F) and 56 mm (2.2 in) of rain.
Is December a good time to visit Helsinki?
least pleasant month Weather score 32/100.
December is one of the least pleasant months for weather in Helsinki. For better conditions, consider Jun–Aug.
Does it rain a lot in Helsinki in December?
Some rain is normal: about 67 mm (2.6 in) falls in an average December. It is the 4th wettest month of the year.
How warm is Helsinki in December?
Days average 1°C (34°F) and nights -1°C (29°F).
Helsinki weather by month
| Month | High | Low | Rain | Cloud | Weather |
|---|---|---|---|---|---|
| January | -1°C (29°F) | -4°C (24°F) | 56 mm | 82% | least pleasant |
| February | -2°C (28°F) | -5°C (22°F) | 45 mm | 79% | least pleasant |
| March | 0°C (33°F) | -3°C (26°F) | 42 mm | 69% | least pleasant |
| April | 5°C (42°F) | 1°C (34°F) | 41 mm | 67% | least pleasant |
| May | 11°C (52°F) | 6°C (43°F) | 48 mm | 62% | fair |
| June | 16°C (60°F) | 11°C (53°F) | 66 mm | 66% | best |
| July | 20°C (67°F) | 16°C (60°F) | 59 mm | 64% | best |
| August | 19°C (66°F) | 15°C (60°F) | 71 mm | 63% | best |
| September | 15°C (59°F) | 12°C (53°F) | 63 mm | 67% | fair |
| October | 9°C (48°F) | 6°C (43°F) | 80 mm | 78% | least pleasant |
| November | 5°C (40°F) | 2°C (36°F) | 75 mm | 85% | least pleasant |
| December | 1°C (34°F) | -1°C (29°F) | 67 mm | 85% | least pleasant |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis). Page updated . How we rate months