The highest day temperature in January 2025 was 32°F. The lowest night temperature was -26°F. The average values for day and night temperatures during January were 10.1°F и 2.9°F respectivly.

The average sea surface temperature in January 2025 for Thunder Bay was 33.4°F. The maximum and minimum values were 32.2°F and 34.8°F respectively.

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

Precipitation total in January for Thunder Bay is 0.3 in. It makes january the least rainy month of the year.

The average wind speed in January is 8.5 mph.

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 Thunder Bay in January is 3.4 hours.