In October warmest sea in Canada is usually observed in the following locations: Niagara-on-the-Lake, Hamilton, Mississauga.
Table below shows the average sea water temperature for marine resorts of Canada in October for the last three years.
| Place name | October 2025 | October 2024 | October 2023 |
|---|---|---|---|
| Niagara-on-the-Lake | 63.2°F | 62.8°F | 61.3°F |
| Hamilton | 63.0°F | 62.0°F | 59.7°F |
| Mississauga | 62.8°F | 60.0°F | 59.6°F |
| Toronto | 62.7°F | 59.3°F | 59.7°F |
| Niagara Falls | 62.4°F | 61.6°F | 61.9°F |
| Oshawa | 62.2°F | 59.0°F | 60.5°F |
| Barrie | 61.7°F | 60.7°F | 60.6°F |
| Windsor | 61.7°F | 59.9°F | 59.2°F |
| Kingston | 61.4°F | 61.7°F | 62.2°F |
| Lunenburg | 58.9°F | 56.3°F | 59.1°F |
| Halifax | 58.6°F | 56.3°F | 58.3°F |
| Quebec | 58.6°F | 58.4°F | 59.7°F |
| Montreal | 58.1°F | 57.6°F | 61.1°F |
| Sydney | 57.5°F | 55.8°F | 57.2°F |
| Charlottetown | 57.5°F | 56.6°F | 58.5°F |
| Prince Edward Island | 57.0°F | 56.6°F | 57.3°F |
| Summerside | 56.7°F | 56.7°F | 58.8°F |
| Moncton | 55.8°F | 54.8°F | 56.6°F |
| Saint John | 54.9°F | 54.8°F | 56.5°F |
| Saint Andrews | 54.8°F | 54.4°F | 54.8°F |
| Les Iles-de-la-Madeleine | 54.7°F | 55.0°F | 54.5°F |
| Thunder Bay | 54.5°F | 54.3°F | 55.7°F |
| Corner Brook | 54.0°F | 51.6°F | 52.4°F |
| Winnipeg | 53.7°F | 52.4°F | 54.1°F |
| Gimli | 53.6°F | 52.7°F | 54.5°F |
| Rocky Harbour | 53.6°F | 51.6°F | 51.5°F |
| Surrey | 53.5°F | 53.4°F | 54.0°F |
| Tofino | 53.5°F | 53.3°F | 55.3°F |
| Nanaimo | 53.3°F | 53.1°F | 52.5°F |
| North Vancouver | 52.6°F | 53.0°F | 52.7°F |
| Vancouver | 52.5°F | 52.9°F | 52.7°F |
| Victoria | 50.8°F | 50.2°F | 51.1°F |
| Bonavista | 50.6°F | 52.6°F | 49.0°F |
| St. John's | 50.2°F | 53.0°F | 49.6°F |
| Trinity | 49.3°F | 52.5°F | 49.8°F |
| Twillingate Island | 48.0°F | 50.7°F | 48.6°F |
| Yellowknife | 47.6°F | 45.2°F | 47.3°F |
Charts below show average sea water temperature for Canada resorts with the warmest sea in October.
You can also check other months of the year to see sea temperature of Canada resorts at that time.
Places in Canada:
Name
°F
