18.12
thu
thu
Day
34°F
NW 6 mph
Precip.
0%
0%
Night
1°F
S 21 mph
Precip.
0%
0%
19.12
fri
fri
Day
5°F
SE 11 mph
Precip.
0%
0%
Night
16°F
NW 13 mph
Precip.
100%
100%
20.12
sat
sat
Day
23°F
NE 11 mph
Precip.
0%
0%
Night
12°F
SE 22 mph
Precip.
0%
0%
21.12
sun
sun
Day
5°F
SE 14 mph
Precip.
0%
0%
Night
-4°F
SE 6 mph
Precip.
0%
0%
22.12
mon
mon
Day
9°F
NW 4 mph
Precip.
30%
30%
Night
30°F
N 14 mph
Precip.
100%
100%
23.12
tue
tue
Day
27°F
E 6 mph
Precip.
0%
0%
Night
12°F
SE 8 mph
Precip.
0%
0%
24.12
wed
wed
Day
10°F
NE 2 mph
Precip.
0%
0%
Night
16°F
SW 6 mph
Precip.
75%
75%
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 December, °F
Show year:
2025
2024
2023
The average sea water temperature in December of 2025 was 38.6°F. The highest and lowest sea temperatures during the month were 41.7°F and 36.9°F.
Sea water temperature in January, °F
Show year:
2025
2024
2023
The average sea water temperature in January of 2025 was 35.1°F. The highest and lowest sea temperatures during the month were 36.3°F and 34.0°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: 00:44
December 18, thursday
0300
32°F
NW
11 mph
11 mph
0600
32°F
NW
6 mph
6 mph
0900
32°F
NW
6 mph
6 mph
1200
34°F
NW
6 mph
6 mph
1500
28°F
S
14 mph
14 mph
1800
14°F
S
17 mph
17 mph
2100
5°F
S
21 mph
21 mph
December 19, friday
0000
1°F
S
21 mph
21 mph
