Current sea water temperature:
+36.9°F
| Minimum sea water temperature in December: | 43.0°F |
| Maximum sea water temperature in December: | 35.1°F |
| Average sea water temperature in December: | 38.6°F |
| more information | |
14 days
forecast
forecast
| Thunder Bay |
monthly
weather
weather
| Thunder Bay |
Sea water temperature for the last 10 days:
| December 17 | 36.9°F | December 12 | 37.4°F |
| December 16 | 37.0°F | December 11 | 37.4°F |
| December 15 | 36.9°F | December 10 | 38.3°F |
| December 14 | 37.2°F | December 9 | 38.5°F |
| December 13 | 37.2°F | December 8 | 38.7°F |
Monthly sea water temperature, °F
When is the warmest sea in Thunder Bay?
Based on the data about daily sea water temperature for the last three years the warmest sea in Thunder Bay was noticed in August, September and July.
Monthly Sea Temperatures in Thunder Bay, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 63.2°F. The highest and lowest sea temperatures during the month were 68.0°F and 59.9°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 59.9°F. The highest and lowest sea temperatures during the month were 62.2°F and 57.4°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 61.1°F. The highest and lowest sea temperatures during the month were 64.9°F and 55.2°F.
current
weather
weather
| Thunder Bay |
weather in
December
December
| Thunder Bay |
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: 14:03
December 17, wednesday
1500
19°F
NE
7 mph
7 mph
1800
23°F
NW
3 mph
3 mph
2100
25°F
NW
3 mph
3 mph
December 18, thursday
0000
28°F
NW
12 mph
12 mph
0300
30°F
NW
11 mph
11 mph
0600
32°F
NW
9 mph
9 mph
0900
32°F
SW
8 mph
8 mph
1200
23°F
S
18 mph
18 mph
