Finland
Helsinki in October: weather, sea & travel advice
This month's data profile
Rain shapes the decision
Helsinki in October is climatically mixed. The average daily high is around 9 °C, and the sea is about 10 °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
21/100 · #9
Warmth
#6
Dryness
#10
Sun
#8
Sea warmth
#5
Published best categories: none
Helsinki · OctoberPhoto: Matti Mattila · CC BY 2.0Climate facts
- Average high
- 9 °C
- Average low
- 6 °C
- Sea
- 10 °C
- Rainy days (est.)
- 14 rainy days (est.)
- Sun (est.)
- 1 h/day
- Humidity
- 86 %
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 |
|---|---|---|---|---|---|---|---|---|---|
| September | 15 | 11 | 12 | 63 | 3.1 | 83 | 3.8 | 15 | 40 |
| October (selected) | 9 | 6 | 14 | 82 | 1.3 | 86 | 4.3 | 10 | 21 |
| November | 4 | 2 | 16 | 76 | 0.4 | 90 | 4.6 | 7 | 15 |
How do the previous and next months compare?
Baseline: October (21/100)
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 | |
|---|---|---|---|---|---|---|---|---|---|
| September | +19 | +5.9 °C | +5.3 °C | -2.7 | -19.6 mm | +1.8 h | -3.7 % | -0.5 m/s | +4.2 °C |
| November | -6 | -4.6 °C | -4.3 °C | +1.3 | -6.8 mm | -0.9 h | +3.2 % | +0.3 m/s | -3.3 °C |
All twelve months in context
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Useful next decisions
Frequently asked questions
How warm is Helsinki in October?
The average daily high is around 9 °C, with an average daily low of about 6 °C.
Can you swim in Helsinki in October?
The sea is about 10 °C (cold).
Does it rain a lot in Helsinki in October?
The curated estimate is about 14 rainy days per month, not a directly measured long-term average. Total precipitation averages around 82 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. October is not among them.