The highest day temperature in January 2026 was 30°F. The lowest night temperature was -12°F. The average values for day and night temperatures during January were 15.3°F и 10.7°F respectivly.

The average sea surface temperature in January 2026 for Sundsvall was 31.8°F. The maximum and minimum values were 28.8°F and 35.6°F respectively.

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

Precipitation total in January for Sundsvall is 1.8 in. It makes january one of the most rainy months of the year.

The average wind speed in January is 7.0 mph. This value is relatively stable throughout the year.

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 Sundsvall in January is 2.3 hours.