Current Sea Water Temperature:
+59.8°F
| Maximum Sea Water Temperature in July: | 69.6°F |
| Minimum Sea Water Temperature in July: | 40.4°F |
| Average water temperature in July: | 59.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| July 30 | 59.8°F | July 25 | 61.2°F |
| July 29 | 60.4°F | July 24 | 61.0°F |
| July 28 | 59.4°F | July 23 | 60.4°F |
| July 27 | 59.4°F | July 22 | 56.8°F |
| July 26 | 60.8°F | July 21 | 53.8°F |
When is the Warmest Sea for Thunder Bay?
According to our data for the last three years for Thunder Bay the highest average sea water temperature was in August, September and July.
Average Water Temperature by Month, °F
Sea Water Temperature in August
The average sea surface temperature in August 2025 for Thunder Bay was 64.6°F. The maximum and minimum values were 61.0°F and 70.0°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Thunder Bay was 61.0°F. The maximum and minimum values were 58.2°F and 63.6°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2026 for Thunder Bay was 51.8°F. The maximum and minimum values were 44.2°F and 61.2°F respectively.
Canada Resorts:
NAME
F°
| Barrie |  |
+58 |
| Halifax |  |
+64 |
| Kingston |  |
+66 |
| Montreal | |
+66 |
| Ottawa | |
+66 |
| Prince Edward Island |  |
+64 |
| Quebec | |
+62 |
| Saint John | |
+64 |
| St. John's |  |
+54 |
| Sydney |  |
+58 |
| Toronto | |
+62 |
| Vancouver | |
+58 |
| Victoria | |
+56 |
| Winnipeg | |
+76 |
| Yellowknife |  |
+54 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Thunder Bay
Local time: 05:01
30 jul, thursday
| 0600 |  |
66°F | N 1 mph |
| 0900 |  |
70°F | NE 3 mph |
| 1200 |  |
86°F | NE 7 mph |
| 1500 | |
86°F | NE 6 mph |
| 1800 |  |
84°F | SE 6 mph |
| 2100 |  |
74°F | NE 12 mph |
31 jul, friday
| 0000 |  |
72°F | SE 9 mph |
| 0300 | |
68°F | SE 4 mph |