Current Sea Water Temperature:
+39.0°F
| Maximum Sea Water Temperature in December: | 42.2°F |
| Minimum Sea Water Temperature in December: | 33.4°F |
| Average water temperature in December: | 37.4°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 04 | 39.0°F | November 29 | 41.2°F |
| December 03 | 38.6°F | November 28 | 41.2°F |
| December 02 | 40.6°F | November 27 | 41.6°F |
| December 01 | 40.8°F | November 26 | 42.0°F |
| November 30 | 40.8°F | November 25 | 43.2°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 2025 for Thunder Bay was 62.4°F. The maximum and minimum values were 55.8°F and 66.6°F respectively.
Canada Resorts:
NAME
F°
| Halifax |  |
+12 |
| Kingston |  |
+4 |
| Moncton | |
-6 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-4 |
| Prince Edward Island |  |
+6 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+28 |
| St. John's | |
+32 |
| Sydney | |
+24 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+12 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Thunder Bay
Local time: 01:04
05 dec, friday
| 0300 |  |
8°F | E 9 mph |
| 0600 |  |
6°F | E 6 mph |
| 0900 |  |
6°F | E 4 mph |
| 1200 |  |
12°F | E 4 mph |
| 1500 | |
18°F | NE 7 mph |
| 1800 | |
18°F | E 7 mph |
| 2100 | |
16°F | E 8 mph |
06 dec, saturday
| 0000 |  |
14°F | SE 14 mph |