The weather in Thunder Bay in October is very cold with temperatures between 3°C and 8°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Thunder Bay during the month of October. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
You can expect a few days of snow in Thunder Bay during October. It’s important to get out your snow boots and warm mittens to stay warm while you explore Thunder Bay.
Our weather forecast can give you a great sense of what weather to expect in Thunder Bay in October 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
8° / 3°
Rainy Days
6
Snowy Days
5
Dry Days
20
Rainfall
74
mm
Sun Hours
8.2
Hrs
