The highest day temperature in March 2025 was 43°F. The lowest night temperature was -6°F. The average values for day and night temperatures during March were 28.5°F и 18.3°F respectivly.

The average sea surface temperature in March 2025 for Thunder Bay was 31.2°F. The maximum and minimum values were 30.4°F and 32.0°F respectively.

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

Precipitation total in March for Thunder Bay is 0.6 in. It makes march one of the least rainy months of the year.

The average wind speed in March is 8.5 mph. It makes March one of the most windy months of the year for Thunder Bay.

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 March is 4.7 hours.