Current Sea Water Temperature:
+45.2°F
| Maximum Sea Water Temperature in May: | 51.6°F |
| Minimum Sea Water Temperature in May: | 38.2°F |
| Average water temperature in May: | 44.0°F |
| detailed information | |
Sea Water Temperature for the Last 10 Days:
| May 19 | 45.2°F | May 14 | 44.0°F |
| May 18 | 44.8°F | May 13 | 43.8°F |
| May 17 | 44.0°F | May 12 | 41.0°F |
| May 16 | 43.6°F | May 11 | 42.2°F |
| May 15 | 43.4°F | May 10 | 42.6°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 |  |
+38 |
| Halifax |  |
+52 |
| Les Iles-de-la-Madeleine | |
+44 |
| Montreal |  |
+74 |
| Ottawa | |
+74 |
| Prince Edward Island | |
+52 |
| Quebec | |
+52 |
| Saint John | |
+48 |
| Sydney |  |
+42 |
| Thunder Bay | |
+40 |
| Tofino | |
+52 |
| Toronto | |
+72 |
| Vancouver | |
+52 |
| Victoria | |
+50 |
| Winnipeg | |
+40 |
Countries:
NAME
POPULARITY
24 Hours Weather Forecast
Saint John
Local time: 10:21
19 may, tuesday
| 1200 |  |
50°F | N 6 mph |
| 1500 | |
52°F | NE 6 mph |
| 1800 | |
56°F | N 6 mph |
| 2100 |  |
54°F | NE 5 mph |
20 may, wednesday
| 0000 | |
52°F | NE 5 mph |
| 0300 |  |
50°F | N 4 mph |
| 0600 | |
52°F | NE 5 mph |
| 0900 | |
66°F | E 7 mph |