The highest day temperature in January 2026 was 38°F. The lowest night temperature was 2°F. The average values for day and night temperatures during January were 16.1°F и 14.1°F respectivly.

The average sea surface temperature in January 2026 for Trondheim was 42.2°F. The maximum and minimum values were 39.8°F and 43.8°F respectively.

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

Precipitation total in January for Trondheim is 2.1 in. It makes january one of the least rainy months of the year.

The average wind speed in January is 8.3 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 Trondheim in January is 2.5 hours.