Average sea water temperature in September:
+58.3°F
| Minimum sea water temperature in September: | 62.6°F |
| Maximum sea water temperature in September: | 55.0°F |
Daily sea water temperature in September, °F
Show year:
2026
2025
2024
The average sea water temperature in September of 2026 was 57.6°F. The highest and lowest sea temperatures during the month were 59.0°F and 56.1°F.
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| Saint John |
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Monthly sea water temperature in Saint John, °F
Which Canada resorts have warmest sea in September?
| Place name | September 2026 | September 2025 |
|---|---|---|
| Windsor | 73.3°F | 68.5°F |
| Niagara-on-the-Lake | 72.2°F | 67.8°F |
| Kingston | 71.2°F | 67.2°F |
| Niagara Falls | 70.7°F | 66.4°F |
| Montreal | 70.0°F | 66.7°F |
| Barrie | 69.7°F | 66.4°F |
| Quebec | 69.2°F | 65.9°F |
| Gimli | 69.0°F | 63.6°F |
| Winnipeg | 68.6°F | 64.2°F |
| Hamilton | 68.1°F | 66.3°F |
| Toronto | 67.4°F | 65.1°F |
| Mississauga | 67.2°F | 65.6°F |
| Oshawa | 67.2°F | 65.2°F |
| Summerside | 65.5°F | 66.2°F |
| Sydney | 64.6°F | 64.8°F |
| Charlottetown | 64.4°F | 65.8°F |
| Thunder Bay | 63.5°F | 59.9°F |
| Halifax | 63.4°F | 65.2°F |
| Prince Edward Island | 63.2°F | 65.0°F |
| Lunenburg | 62.8°F | 65.4°F |
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: 15:00
September 15, tuesday
1800
59°F
N
5 mph
5 mph
2100
50°F
W
1 mph
1 mph
September 16, wednesday
0000
50°F
N
1 mph
1 mph
0300
48°F
S
1 mph
1 mph
0600
48°F
NE
2 mph
2 mph
0900
54°F
NE
6 mph
6 mph
1200
61°F
NE
11 mph
11 mph
1500
63°F
NE
13 mph
13 mph
