Best year time to visit Thunder Bay

General weather information about Thunder Bay

Average annual temperature is 10.3 °C

Absolute maximum temperature: 30.5 °C

Absolute minimum temperature: -15.0 °C

Number of sunny days: 135 days

Number of rainy days: 202 days

Number of snow days: 28 days

Look at detailed online map of Thunder Bay

* Weather data for Thunder Bay Canada is based on climate observations for 2026 year

Thunder Bay air temperature forecast for each month

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Absolute maximum temperature (°C)	9.3	12.7	10.2	24.8	29.0	30.5	29.5	29.4	29.0	26.8	14.5	12.7
Average daytime temperature (°C)	3.0	4.2	4.7	13.1	18.2	22.8	25.1	23.6	22.0	15.4	8.4	6.7
Average temperature (°C)	0.4	0.0	1.2	7.9	13.0	18.6	21.7	20.1	18.2	12.7	5.3	4.2
Average night temperature (°C)	-1.6	-3.0	-1.5	4.1	8.5	14.8	18.7	17.1	15.1	10.3	2.6	2.1
Absolute minimum temperature (°C)	-9.0	-15.0	-7.4	-4.2	2.7	10.5	14.9	12.8	10.3	1.5	-4.1	-3.8

Thunder Bay monthly weather indicators

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Daylight maximum duration (h)	9.0	11.0	12.0	14.0	15.0	15.0	15.0	14.0	13.0	11.0	10.0	9.0
Daylight mean duration (h)	9.4	10.5	11.9	13.4	14.6	15.3	15.0	13.9	12.5	11.0	9.8	9.1
Daylight minimum duration (h)	9.0	9.0	11.0	12.0	14.0	15.0	14.0	13.0	11.0	10.0	9.0	9.0
Sunshine mean duration (h)	2.5	6.2	5.9	8.9	11.4	10.9	11.6	10.2	9.7	6.0	5.4	3.5
Precipitation (mm)	121	80	103	124	47	88	118	108	19	80	65	99
Sunny days	6	11	8	12	21	11	8	9	17	9	12	11
Rainy days	15	12	13	18	10	19	23	22	13	22	15	20
Snow days	10	5	10	0	0	0	0	0	0	0	3	0

Thunder Bay - weather forecast by months

Thunder Bay weather in january Thunder Bay weather in february Thunder Bay weather in march Thunder Bay weather in april Thunder Bay weather in may Thunder Bay weather in june Thunder Bay weather in july Thunder Bay weather in august Thunder Bay weather in september Thunder Bay weather in october Thunder Bay weather in november Thunder Bay weather in december

Best time to visit Thunder Bay:

The best time to visit Thunder Bay during the most sunny months:

May — 11.4(h)
June — 10.9(h)
July — 11.6(h)
August — 10.2(h)
September — 9.7(h)

Months with the longest average daylight duration in Thunder Bay:

June — 15.3(h)

The largest precipitation sum in Thunder Bay is at

January — 121(mm)

April — 124(mm)

July — 118(mm)

Weather forecast in the closest to Thunder Bay admin centers