15.09
tue
tue
Day
59°F
E 20 mph
Precip.
25%
25%
Night
54°F
E 9 mph
Precip.
11%
11%
16.09
wed
wed
Day
52°F
SW 1 mph
Precip.
14%
14%
Night
52°F
NE 4 mph
Precip.
14%
14%
17.09
thu
thu
Day
57°F
SE 5 mph
Precip.
5%
5%
Night
52°F
S 11 mph
Precip.
16%
16%
18.09
fri
fri
Day
50°F
W 12 mph
Precip.
15%
15%
Night
50°F
W 7 mph
Precip.
20%
20%
19.09
sat
sat
Day
52°F
W 8 mph
Precip.
6%
6%
Night
52°F
S 4 mph
Precip.
7%
7%
20.09
sun
sun
Day
54°F
W 12 mph
Precip.
21%
21%
Night
54°F
SW 8 mph
Precip.
23%
23%
21.09
mon
mon
Day
54°F
W 14 mph
Precip.
18%
18%
Night
52°F
W 7 mph
Precip.
34%
34%
sea water
temperature
temperature
| Thunder Bay |
monthly
weather
weather
| Thunder Bay |
current
weather
weather
| Thunder Bay |
14 days
forecast
forecast
| Thunder Bay |
Sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 63.5°F. The highest and lowest sea temperatures during the month were 65.5°F and 60.6°F.
Air temperature in Thunder Bay, °F
Precipitation total in Thunder Bay, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Thunder Bay
Thunder Bay on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Thunder Bay
Local time: 13:54
September 15, tuesday
1500
57°F
E
17 mph
17 mph
1800
63°F
E
17 mph
17 mph
2100
59°F
E
7 mph
7 mph
September 16, wednesday
0000
54°F
E
9 mph
9 mph
0300
50°F
SE
11 mph
11 mph
0600
46°F
SE
8 mph
8 mph
0900
45°F
SE
8 mph
8 mph
1200
52°F
SW
1 mph
1 mph
