Best Time to Visit Thunder Bay
Best time: Jun, Jul, Aug, May.
Jul is warmest (25.6°C high); Jul is rainiest (89 mm).
Thunder Bay weather by month
| Month | High °C | Low °C | Rain mm | Sun hrs |
|---|---|---|---|---|
| Jan | -8.8 | -20.1 | 34 | 1.9 |
| Feb | -5.9 | -18 | 26 | 3.2 |
| Mar | 0.4 | -11.2 | 43 | 5.2 |
| Apr | 8.8 | -3.3 | 44 | 7.5 |
| May | 16.9 | 3.6 | 70 | 8.9 |
| Jun | 22.4 | 9 | 83 | 9.4 |
| Jul | 25.6 | 12.2 | 89 | 9.4 |
| Aug | 24.4 | 11.4 | 84 | 8 |
| Sep | 18.3 | 6.6 | 83 | 5.5 |
| Oct | 11.1 | 1.2 | 66 | 3.2 |
| Nov | 2.3 | -6.2 | 56 | 1.8 |
| Dec | -5.4 | -15.4 | 39 | 1.4 |
Average high temperature
Best months by activity
Overall: JunJulAugMay
Beaches: JulAugAprFeb
Hiking: MayJunJulAug
Sightseeing: JunJulAugMay
Thunder Bay quick facts
What to pack
Cold months (Jan, Feb, Mar, Apr, Oct, Nov, Dec): warm layers and a coat.
Frequently asked questions
When is the best time to visit Thunder Bay?
Jun, Jul, Aug, May.
What is the rainiest month?
Jul, about 89 mm.
What is the warmest month?
Jul, with average highs of 25.6°C.
Where to stay
See Thunder Bay hotels · Book Thunder Bay tours & activities
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Climate data: Open-Meteo Historical (ERA5), 1991–2020 climate normals.
Licensed under CC BY 4.0.
Open-Meteo.