Current Sea Water Temperature:
+47.0°F
| Maximum Sea Water Temperature in December: | 49.6°F |
| Minimum Sea Water Temperature in December: | 39.4°F |
| Average water temperature in December: | 45.6°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| December 04 | 47.0°F | November 29 | 46.8°F |
| December 03 | 47.4°F | November 28 | 47.6°F |
| December 02 | 47.2°F | November 27 | 47.0°F |
| December 01 | 47.4°F | November 26 | 47.6°F |
| November 30 | 47.4°F | November 25 | 47.8°F |
When is the Warmest Sea for Saint John?
According to our data for the last three years for Saint John 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 Saint John was 60.5°F. The maximum and minimum values were 58.0°F and 63.0°F respectively.
Sea Water Temperature in September
The average sea surface temperature in September 2025 for Saint John was 59.4°F. The maximum and minimum values were 57.4°F and 62.4°F respectively.
Sea Water Temperature in July
The average sea surface temperature in July 2025 for Saint John was 56.1°F. The maximum and minimum values were 49.8°F and 64.6°F respectively.
Canada Resorts:
NAME
F°
| Halifax |  |
+24 |
| Kingston |  |
+4 |
| Moncton | |
+2 |
| Montreal | |
-2 |
| Niagara Falls | |
+10 |
| Ottawa | |
-4 |
| Prince Edward Island | |
+16 |
| Quebec | |
-12 |
| Rocky Harbour |  |
+28 |
| St. John's |  |
+32 |
| Sydney | |
+34 |
| Toronto | |
+10 |
| Vancouver | |
+42 |
| Victoria | |
+44 |
| Winnipeg | |
+12 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Saint John
Local time: 01:26
05 dec, friday
| 0300 |  |
0°F | SE 16 mph |
| 0600 | |
-2°F | SE 14 mph |
| 0900 |  |
4°F | SE 12 mph |
| 1200 | |
16°F | SE 12 mph |
| 1500 | |
20°F | E 10 mph |
| 1800 | |
20°F | E 6 mph |
| 2100 | |
16°F | SE 4 mph |
06 dec, saturday
| 0000 | |
14°F | SE 3 mph |