Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 17°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

Monday
14th Sep
17

6

2

4
Tuesday
15th Sep
18

10

2

2

5-day weather forecast updated at 04:00 on Thursday 10th September 2026 GMT

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The 5-day weather forecast for Ontario (Thunder Bay) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Thunder Bay weather forecast by day

Below are the detailed weather forecasts for Thunder Bay for the next 5 days.

Thunder Bay weather for Monday 14th September 2026

Expect mostly cloudy with rain in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 4 (Moderate) and 2 hours of bright sunshine. There are 5-10 mm of rainfall expected with 81% chance of some rain and a moderate breeze of 21 kph from the south-east.

17
°C maximum temperature
6
°C minimum temperature
mostly cloudy with rain
2
hours of sunshine
4
UV index (Moderate)
81
% chance of some rain
<10
mm of rainfall expected
17
°C wind chill
21
kph wind from SE

Thunder Bay weather for Tuesday 15th September 2026

Expect mostly cloudy with light rain in Thunder Bay, Ontario with a maximum temperature of 18°C, maximum UV of 2 (Low) and 2 hours of bright sunshine. There are 0-2 mm of rainfall expected with 52% chance of some rain and a moderate breeze of 22 kph from the west.

18
°C maximum temperature
10
°C minimum temperature
mostly cloudy with light rain
2
hours of sunshine
2
UV index (Low)
52
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
22
kph wind from W

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Ontario - quick facts
Flight time^✝	8 hours
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