Weather in Helsinki: October
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Average day temperature: | 47.9°F |
| Average night temperature: | 44.0°F | |
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Sea water temperature: | 50.3°F |
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Number of sunny days: | 6 days |
| Day length: | 8.8 - 11.4 hours | |
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Number of rainy days: | 4 days |
| Precipitation totals: | 2.1 in. | |
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forecast
| Helsinki |
temperature
| Helsinki |
Air temperature in October, °F
The highest day temperature during October of 2025 was 55°F. At the same time the lowest night temperature was 35°F. Daily and nightly averages during October were 48.4°F and 45.9°F.
Sea water temperature in Helsinki in October, °F
The average sea water temperature in October of 2025 was 50.5°F. The highest and lowest sea temperatures during the month were 54.9°F and 46.8°F.
Mostly all days in October are cloudy but sunny and partly cloudy days are also possible.
Precipitation total in October, in.
Precipitation total value in Helsinki in October is 2.4 in. Other months of the year show relatively similar values.
The average wind speed value in October is 11.1 mph It makes October one of the most windy months of the year.
This chart shows average number of hours during the day when sunlight can reach the ground. It depends on day length and cloudiness during the day. The average number of sunny hours in October is: 3.9.
Best time for vacation in Helsinki
Helsinki on a weather map
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