Current sea water temperature:
+49.6°F
| Minimum sea water temperature in July: | 67.6°F |
| Maximum sea water temperature in July: | 41.4°F |
| Average sea water temperature in July: | 58.6°F |
| more information | |
14 days
forecast
forecast
| Thunder Bay |
monthly
weather
weather
| Thunder Bay |
Sea water temperature for the last 10 days:
| July 17 | 49.6°F | July 12 | 46.4°F |
| July 16 | 48.7°F | July 11 | 44.8°F |
| July 15 | 50.5°F | July 10 | 49.5°F |
| July 14 | 49.6°F | July 9 | 48.7°F |
| July 13 | 46.4°F | July 8 | 48.0°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 47.8°F. The highest and lowest sea temperatures during the month were 50.5°F and 44.8°F.
current
weather
weather
| Thunder Bay |
weather in
July
July
| 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: 07:28
July 17, friday
0900
66°F
NE
1 mph
1 mph
1200
66°F
N
2 mph
2 mph
1500
73°F
N
4 mph
4 mph
1800
81°F
N
6 mph
6 mph
2100
59°F
N
4 mph
4 mph
July 18, saturday
0000
61°F
NE
7 mph
7 mph
0300
59°F
N
1 mph
1 mph
0600
61°F
SE
6 mph
6 mph
