Current sea water temperature:
+59.0°F
| Minimum sea water temperature in August: | 69.6°F |
| Maximum sea water temperature in August: | 56.1°F |
| Average sea water temperature in August: | 63.3°F |
| more information | |
14 days
forecast
forecast
| Thunder Bay |
monthly
weather
weather
| Thunder Bay |
Sea water temperature for the last 10 days:
| August 6 | 59.0°F | August 1 | 57.6°F |
| August 5 | 63.1°F | July 31 | 57.4°F |
| August 4 | 63.7°F | July 30 | 58.8°F |
| August 3 | 63.0°F | July 29 | 59.4°F |
| August 2 | 60.4°F | July 28 | 58.5°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:
2026
2025
2024
The average sea water temperature in July of 2026 was 51.8°F. The highest and lowest sea temperatures during the month were 60.1°F and 44.8°F.
current
weather
weather
| Thunder Bay |
weather in
August
August
| 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: 09:53
August 06, thursday
1200
84°F
NE
12 mph
12 mph
1500
88°F
N
17 mph
17 mph
1800
77°F
N
14 mph
14 mph
2100
68°F
NE
9 mph
9 mph
August 07, friday
0000
68°F
NE
9 mph
9 mph
0300
59°F
NE
7 mph
7 mph
0600
57°F
E
6 mph
6 mph
0900
59°F
SE
5 mph
5 mph
