The highest day temperature in January 2025 was 38°F. The lowest night temperature was 17°F. The average values for day and night temperatures during January were 31.4°F и 30.2°F respectivly.

The average sea surface temperature in January 2025 for Helsinki was 33.3°F. The maximum and minimum values were 31.8°F and 35.4°F respectively.

Most of the days in January are gloomy but you can also expect sunny days.

Precipitation total in January for Helsinki is 2.1 in.

The average wind speed in January is 11.8 mph. It makes January one of the most windy months of the year for Helsinki.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Helsinki in January is 1.7 hours.