Finland
Helsinki in January: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Helsinki in January is climatically mixed. The average daily high is around -1 °C, and the sea is about 2 °C. With about 14 rainy days it is wet.
Historical monthly averages, not a weather forecast. Individual days and years can differ substantially.
Rank among 12 monthly averages
16/100 · #10
Warmth
#11
Dryness
#9
Sun
#11
Sea warmth
#10
Published best categories: none
Helsinki · JanuaryPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- -1 °C
- Average low
- -4 °C
- Sea
- 2 °C
- Rainy days (est.)
- 14 rainy days (est.)
- Sun (est.)
- 0 h/day
- Humidity
- 93 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| December | 1 | -2 | 15 | 66 | 0.2 | 92 | 4.6 | 4 | 15 |
| January (selected) | -1 | -4 | 14 | 60 | 0.3 | 93 | 4.4 | 2 | 16 |
| February | -2 | -6 | 11 | 46 | 1.0 | 94 | 3.9 | 1 | 23 |
How do the previous and next months compare?
Baseline: January (16/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| December | -1 | +2.1 °C | +2.4 °C | +1.2 | +5.5 mm | -0.1 h | -1.2 % | +0.2 m/s | +2.2 °C |
| February | +7 | -1.2 °C | -1.3 °C | -3 | -14.5 mm | +0.7 h | +0.6 % | -0.5 m/s | -1.3 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Helsinki in January?
The average daily high is around -1 °C, with an average daily low of about -4 °C.
Can you swim in Helsinki in January?
The sea is about 2 °C (cold).
Does it rain a lot in Helsinki in January?
The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 60 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. January is not among them.