Finland
Helsinki in December: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Helsinki in December is climatically mixed. The average daily high is around 1 °C, and the sea is about 4 °C. With about 15 rainy days it is very wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
15/100 · #11
Warmth
#9
Dryness
#11
Sun
#12
Sea warmth
#8
Published best categories: none
Helsinki · DecemberPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- 1 °C
- Average low
- -2 °C
- Sea
- 4 °C
- Rainy days (est.)
- 15 rainy days (est.)
- Sun (est.)
- 0 h/day
- Humidity
- 92 %
Climate evidence with direct month comparison
The highlighted row is the selected month. Precipitation total and rainy days are separate monthly averages.
| Month | Avg high °C | Avg low °C | Rainy days (est.) | Precipitation mm | Sun h/day (est.) | Humidity % | Wind m/s | Sea °C | Score |
|---|---|---|---|---|---|---|---|---|---|
| November | 4 | 2 | 16 | 76 | 0.4 | 90 | 4.6 | 7 | 15 |
| December (selected) | 1 | -2 | 15 | 66 | 0.2 | 92 | 4.6 | 4 | 15 |
| January | -1 | -4 | 14 | 60 | 0.3 | 93 | 4.4 | 2 | 16 |
How do the previous and next months compare?
Baseline: December (15/100)
Positive and negative values show the change from the selected month.
| Score Δ | Average high Δ | Average low Δ | Rainy days Δ | Rain Δ | Sun Δ | Humidity Δ | Wind Δ | Sea Δ | |
|---|---|---|---|---|---|---|---|---|---|
| November | ±0 | +3.3 °C | +3.8 °C | +0.7 | +9.8 mm | +0.2 h | -2.2 % | ±0 m/s | +2.8 °C |
| January | +1 | -2.1 °C | -2.4 °C | -1.2 | -5.5 mm | +0.1 h | +1.2 % | -0.2 m/s | -2.2 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Helsinki in December?
The average daily high is around 1 °C, with an average daily low of about -2 °C.
Can you swim in Helsinki in December?
The sea is about 4 °C (cold).
Does it rain a lot in Helsinki in December?
The curated estimate is about 15 rainy days per month, not a directly measured long-term average. Total precipitation averages around 66 mm for the month. A rainy day does not mean all-day rain.
When is the best time to visit Helsinki?
By the climate score, July are the strongest months for Helsinki. December is not among them.