The temperatures in Thunder Bay in July are comfortable with low of 13°C and and high up to 21°C.
You can expect about 3 to 8 days of rain in Thunder Bay during the month of July. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Thunder Bay in July 2025.
If you’re planning to visit Thunder Bay in the near future, we highly recommend that you review the 14 day weather forecast for Thunder Bay before you arrive.
Temperatures
21° / 13°
Rainy Days
5
Snowy Days
0
Dry Days
26
Rainfall
90
mm
Sun Hours
10.5
Hrs
