Thunder Bay weather live forecast

Today's maximum temperature in Thunder Bay is expected to be 15°C. Select a day from the live weather forecast for Thunder Bay, Ontario, Canada for more weather parameters.

Monday
21st Sep
15

3

6

4
Tuesday
22nd Sep
16

1

10

4
Wednesday
23rd Sep
17

4

11

4
Thursday
24th Sep
16

7

0

4
Friday
25th Sep
19

9

1

3

5-day weather forecast updated at 04:02 on Monday 21st September 2026 GMT

More about Thunder Bay

Thunder Bay by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Ontario

Air Canada: Top flight deals to Canada

Sale

Discover top Air Canada offers on flights to Canada
Browse lowest fares available or search by date
Book flights to Toronto, Vancouver, Calgary, Montreal & more

Go to Air Canada deal >>

View all Air Canada offers

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 21st September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 15°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south-east.

15
°C maximum temperature
3
°C minimum temperature
broken clouds
6
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
10
kph wind from SE

Thunder Bay weather for Tuesday 22nd September 2026

Expect scattered clouds in Thunder Bay, Ontario with a maximum temperature of 16°C, maximum UV of 4 (Moderate) and 10 hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 10 kph from the south-east.

16
°C maximum temperature
1
°C minimum temperature
scattered clouds
10
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
16
°C wind chill
10
kph wind from SE

Thunder Bay weather for Wednesday 23rd September 2026

Expect clear skies in Thunder Bay, Ontario with a maximum temperature of 17°C, maximum UV of 4 (Moderate) and 11 hours of bright sunshine. There are 0 mm of rainfall expected and a gentle breeze of 13 kph from the south-east.

17
°C maximum temperature
4
°C minimum temperature
clear skies
11
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
0
no heat & humidity
13
kph wind from SE

Thunder Bay weather for Thursday 24th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 16°C, maximum UV of 4 (Moderate) and no hours of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 12 kph from the south.

16
°C maximum temperature
7
°C minimum temperature
broken clouds
0
hours of sunshine
4
UV index (Moderate)
0
mm of rainfall expected
16
°C wind chill
12
kph wind from S

Thunder Bay weather for Friday 25th September 2026

Expect broken clouds in Thunder Bay, Ontario with a maximum temperature of 19°C, maximum UV of 3 (Moderate) and 1 hour of bright sunshine. There are 0 mm of rainfall expected and a light breeze of 9 kph from the south-east.

19
°C maximum temperature
9
°C minimum temperature
broken clouds
1
hour of sunshine
3
UV index (Moderate)
0
mm of rainfall expected
19
°C wind chill
9
kph wind from SE

Crystal Ski: Top ski deals to Canada

Sale

Save on skiing holidays to Canada in winter 2025/2026
Book early with Crystal Ski for the best deals
Filter by promotional offers, duration, board basis & more

Go to Crystal Ski deal >>

View all Crystal Ski offers

More about Ontario

Be inspired

Get your weekly fix of holiday inspiration from some of the world's best travel writers plus save on your next trip with the latest exclusive offers

We promise not to share your details

Popular travel offers

Ontario - quick facts
Flight time^✝	8 hours
Time difference	UK -5 to -6 hours
Language(s)	English, French
Currency	Canadian Dollar
Electricity	A + B plug (120V)
Driving side	Right
Visa^✝	Yes