Most Daily Precipitation in Thunder Bay History

This is a list of the largest daily precipitation totals ever recorded in Thunder Bay, Ontario history from 1941–2024.

What's the Most It Has Ever Rained in Thunder Bay?

According to NOAA records, the most rain that Thunder Bay, Ontario has ever received in a single day is 13.1 cm which occurred on Thursday September 8, 1977.

Also see most rain in: 2 days | 1 week | 1 month

Thunder Bay Most Rain in One Day

Rank	Precipitation	Date
1	13.1 cm	September 8, 1977
2	11.7 cm	April 20, 2003
3	9.8 cm	September 10, 1961
4	9.6 cm	July 2, 1997
5	9.1 cm	May 27, 2012
6	8.7 cm	August 19, 1973
7	8.3 cm	June 28, 1996
8	8.0 cm	June 25, 2016
9	7.9 cm	June 6, 2008
10	7.8 cm	November 28, 2016
11	7.6 cm	May 24, 1971
12	7.0 cm	August 30, 1958
13	6.9 cm	April 30, 1954
14	6.9 cm	July 31, 2006
15	6.3 cm	November 21, 1973
16	6.1 cm	August 13, 1945
17	6.0 cm	November 1, 1991
18	5.8 cm	August 31, 1981
19	5.5 cm	May 20, 2013
20	5.5 cm	August 18, 1959