Current Sea Water Temperature:
+36.8°F
| Maximum Sea Water Temperature in April: | 42.2°F |
| Minimum Sea Water Temperature in April: | 32.6°F |
| Average water temperature in April: | 37.0°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| April 21 | 36.8°F | April 16 | 36.0°F |
| April 20 | 37.4°F | April 15 | 37.0°F |
| April 19 | 37.2°F | April 14 | 35.6°F |
| April 18 | 37.2°F | April 13 | 35.4°F |
| April 17 | 35.6°F | April 12 | 36.0°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°
| Bonavista |  |
+30 |
| Halifax |  |
+30 |
| Les Iles-de-la-Madeleine |  |
+26 |
| Montreal |  |
+26 |
| Ottawa |  |
+24 |
| Prince Edward Island | |
+28 |
| Quebec | |
+22 |
| Saint John | |
+28 |
| Sydney | |
+26 |
| Thunder Bay | |
+28 |
| Tofino | |
+48 |
| Toronto | |
+30 |
| Vancouver | |
+50 |
| Victoria | |
+52 |
| Winnipeg | |
+30 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Saint John
Local time: 07:00
21 apr, tuesday
| 0900 |  |
32°F | S 6 mph |
| 1200 | |
36°F | SE 1 mph |
| 1500 | |
36°F | NE 7 mph |
| 1800 | |
38°F | N 6 mph |
| 2100 |  |
30°F | NE 5 mph |
22 apr, wednesday
| 0000 | |
26°F | E 5 mph |
| 0300 | |
26°F | SE 1 mph |
| 0600 | |
26°F | NW 2 mph |