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Thunder Bay July Weather

Averages and records for weather in Thunder Bay, Ontario in the month of July.

Typical Thunder Bay July Weather 1991–2020
Average daily high	24.6 °C
Average daily low	11.0 °C
Average monthly precipitation	7.5 cm
Daily chance of precipitation	44.2%

Thunder Bay July Weather Records 1941–2024
Highest temperature	37.2 °C	July 30, 1975
Lowest temperature	0.0 °C	July 6, 1969
Highest daily low	20.0 °C	July 22, 1955
Lowest daily high	10.6 °C	July 1, 1950
Hottest average high temperature	27.7 °C	2002
Coldest average high temperature	20.3 °C	1992
Most daily precipitation	9.6 cm	July 2, 1997
Most monthly precipitation	20.3 cm	1993

Note: Daily averages are a moving average which includes 14 days before and after

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
July 1	23.5	10.0	32.2	2.8
July 2	23.6	10.1	34.1	2.9
July 3	23.7	10.3	34.3	2.8
July 4	23.7	10.4	32.2	4.1
July 5	23.8	10.4	32.1	2.2
July 6	23.8	10.5	35.1	0.0
July 7	24.0	10.6	35.8	3.9
July 8	24.1	10.7	32.2	1.6
July 9	24.2	10.7	31.2	2.8
July 10	24.2	10.8	32.3	1.7
July 11	24.2	10.9	33.8	2.8
July 12	24.3	10.9	34.4	4.3
July 13	24.3	11.0	35.0	4.1
July 14	24.4	11.0	34.1	3.4
July 15	24.5	11.0	34.7	4.4
July 16	24.6	11.1	35.7	2.8
July 17	24.7	11.1	33.4	4.5
July 18	24.8	11.2	32.6	2.8
July 19	24.8	11.2	32.2	4.2
July 20	24.8	11.2	35.0	4.4
July 21	24.8	11.2	33.8	3.9
July 22	24.9	11.2	32.2	5.3
July 23	24.9	11.2	33.6	5.0
July 24	24.9	11.2	32.7	2.8
July 25	24.9	11.2	32.2	5.6
July 26	24.9	11.3	33.3	3.4
July 27	24.9	11.2	31.8	1.1
July 28	24.9	11.1	35.0	6.1
July 29	24.9	11.0	32.8	3.3
July 30	24.9	11.0	37.2	4.3
July 31	24.8	10.9	32.8	3.9

Weather Station Details

Years	Station	Coordinates
2004–2024	Thunder Bay CS	location
1941–2003	Thunder Bay A	location