Current sea water temperature:
+42.3°F
| Minimum sea water temperature in December: | 49.6°F |
| Maximum sea water temperature in December: | 40.5°F |
| Average sea water temperature in December: | 45.9°F |
| more information | |
14 days
forecast
forecast
| Saint John |
monthly
weather
weather
| Saint John |
Sea water temperature for the last 10 days:
| December 28 | 42.3°F | December 23 | 43.5°F |
| December 27 | 42.8°F | December 22 | 43.3°F |
| December 26 | 43.3°F | December 21 | 43.9°F |
| December 25 | 43.2°F | December 20 | 43.5°F |
| December 24 | 43.5°F | December 19 | 43.5°F |
Monthly sea water temperature, °F
When is the warmest sea in Saint John?
Based on the data about daily sea water temperature for the last three years the warmest sea in Saint John was noticed in August, September and July.
Monthly Sea Temperatures in Saint John, °F
Sea water temperature in August, °F
Show year:
2025
2024
2023
The average sea water temperature in August of 2025 was 59.5°F. The highest and lowest sea temperatures during the month were 61.7°F and 57.2°F.
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 58.5°F. The highest and lowest sea temperatures during the month were 61.2°F and 56.7°F.
Sea water temperature in July, °F
Show year:
2025
2024
2023
The average sea water temperature in July of 2025 was 55.5°F. The highest and lowest sea temperatures during the month were 63.1°F and 49.8°F.
current
weather
weather
| Saint John |
weather in
January
January
| Saint John |
Best time for vacation in Saint John
Saint John on a weather map
Places in Canada:
Name
°F
24 Hours Forecast
Saint John
Local time: 02:43
December 29, monday
0300
19°F
NE
2 mph
2 mph
0600
18°F
E
2 mph
2 mph
0900
27°F
NW
4 mph
4 mph
1200
34°F
NW
10 mph
10 mph
1500
36°F
NW
15 mph
15 mph
1800
37°F
NW
17 mph
17 mph
2100
39°F
NW
21 mph
21 mph
December 30, tuesday
0000
41°F
NW
11 mph
11 mph
