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Thunder Bay April Weather

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

Typical Thunder Bay April Weather 1991–2020
Average daily high	8.7 °C
Average daily low	-4.1 °C
Average monthly precipitation	5.7 cm
Daily chance of precipitation	38.1%

Thunder Bay April Weather Records 1941–2024
Highest temperature	28.3 °C	April 29, 1965
Lowest temperature	-22.2 °C	April 4, 1954
Highest daily low	13.9 °C	April 29, 1949
Lowest daily high	-12.2 °C	April 2, 1954
Hottest average high temperature	14.4 °C	1987
Coldest average high temperature	2.8 °C	1950
Most daily precipitation	11.7 cm	April 20, 2003
Most monthly precipitation	18.8 cm	2001

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

Day	Average (°C)		Record (°C)
Day	High	Low	High	Low
April 1	5.2	-6.6	17.9	-17.2
April 2	5.4	-6.4	16.7	-21.1
April 3	5.6	-6.3	17.3	-21.1
April 4	5.9	-6.0	18.3	-22.2
April 5	6.1	-5.8	22.3	-20.5
April 6	6.4	-5.5	22.0	-17.7
April 7	6.7	-5.4	19.3	-19.4
April 8	6.9	-5.2	16.0	-21.1
April 9	7.3	-5.0	20.9	-17.3
April 10	7.5	-4.8	21.5	-13.1
April 11	7.7	-4.6	19.0	-10.6
April 12	7.9	-4.5	22.8	-15.6
April 13	8.1	-4.4	20.0	-12.9
April 14	8.3	-4.3	26.7	-15.6
April 15	8.6	-4.2	23.1	-13.3
April 16	8.9	-4.0	21.2	-14.1
April 17	9.1	-3.8	23.9	-18.4
April 18	9.4	-3.6	25.6	-16.4
April 19	9.7	-3.5	25.6	-12.7
April 20	10.0	-3.2	27.4	-12.7
April 21	10.3	-3.0	20.0	-16.4
April 22	10.6	-2.8	26.6	-10.0
April 23	10.9	-2.6	25.7	-9.4
April 24	11.1	-2.4	28.3	-10.0
April 25	11.3	-2.2	24.2	-9.0
April 26	11.5	-2.0	20.1	-7.6
April 27	11.7	-1.9	21.1	-9.5
April 28	11.9	-1.7	23.8	-9.4
April 29	12.1	-1.5	28.3	-10.6
April 30	12.3	-1.3	27.8	-7.2

Weather Station Details

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