Thunder Bay Average Rainfall by Month

This page shows the average precipitation in each month of the year in Thunder Bay, Ontario. It is based on NOAA data for the years 1991–2020.
What's the Rainiest Month in Thunder Bay?
In Thunder Bay, June has the greatest precipitation of any month. On average, Thunder Bay gets 8.5 cm of precipitation in June.
June is also the month where rain is most common. 48.6% of days in June will have at least some rain.
What's the Driest Month in Thunder Bay?
In Thunder Bay, February has the least precipitation of any month. On average, Thunder Bay gets 1.83 cm of precipitation in February.
March is the month with the lowest chance of precipitation. 34.1% of days in March will have measurable rain.
Month Precipitation % Chance
January 2.50 cm 40.7
February 1.83 cm 36.0
March 2.93 cm 34.1
April 5.74 cm 38.1
May 7.30 cm 45.7
June 8.50 cm 48.6
July 7.49 cm 44.2
August 6.46 cm 42.1
September 6.46 cm 46.9
October 5.96 cm 44.3
November 4.17 cm 39.3
December 2.68 cm 38.8
Year 61.02 cm 41.0
Weather Station Details
Years Station Coordinates
2004–2024 Thunder Bay CS location
1941–2003 Thunder Bay A location
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