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Warmest sea in Canada in September

829 coastal locations in Canada ranked by their typical September sea temperature. Region-wide average in September: 12.9°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

Pelee Island

22.0°C September mean in Canada

Regional September average

12.9°C

across all 829 coastal locations in Canada

Vs annual mean

+5.9°C

above the year-round regional average

What the Canada sea feels like in September

Water at this temperature is cold and will feel very cold initially, but the body will get used to it and longer swims are possible. Experienced swimmers can manage several hours of swimming, however hypothermia is still a real risk.

Canada monthly average 1.8°C to 14.4°C
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  • Warmest month August 14.4°C
  • Coldest month February 1.8°C
  • Annual mean 7.0°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve Canada month rankings:

Canada sea temperature map (live)

The map shows today's latest reading at every Canada location. The list below is based on the typical September mean, useful for trip planning weeks or months ahead.

Zoom in to see individual locations. Click a pin for water temperatures. View list →
°C -2 0 1 3 5 7 9 11 13 15 17 19 21 24 27 30 35

Top 50 warmest Canada locations in September

Sorted by the typical September mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# Location September mean
1 Pelee Island Ontario 22.0°C
2 Point Pelee Ontario 22.0°C
3 Colchester Ontario 21.9°C
4 Chatham-Kent Ontario 21.9°C
5 Mitchell's Bay Ontario 21.9°C
6 Fort Erie Ontario 21.6°C
7 Port Stanley Ontario 21.6°C
8 Crystal Beach Ontario 21.5°C
9 Port Burwell Ontario 21.5°C
10 Long Point Ontario 21.5°C
11 Port Rowan Ontario 21.5°C
12 Turkey Point Ontario 21.5°C
13 Port Colborne Ontario 21.5°C
14 Port Dover Ontario 21.4°C
15 Montreal Quebec 20.7°C
16 Kingston Ontario 20.6°C
17 Brockville Ontario 20.6°C
18 Ottawa Ontario 20.6°C
19 Greater Napanee Ontario 20.6°C
20 Leamington Ontario 20.6°C
21 St. Clair River (Port Lambton) Ontario 20.6°C
22 Windsor Ontario 20.5°C
23 Sandbanks Ontario 20.5°C
24 Picton Ontario 20.5°C
25 Brighton Ontario 20.3°C
Show 25 more ▸
26 Cobourg Ontario 20.3°C
27 Port Darlington Ontario 20.1°C
28 Niagara Falls Ontario 20.1°C
29 Scarborough Bluffs Ontario 20.1°C
30 St. Catharines Ontario 20.1°C
31 Thorold Ontario 20.1°C
32 Sarnia Ontario 20.0°C
33 Oshawa Ontario 20.0°C
34 Brights Grove Ontario 19.9°C
35 Niagara-on-the-Lake Ontario 19.9°C
36 Rouge Beach Ontario 19.9°C
37 Highland Glen Ontario 19.9°C
38 Kennedy Acres Ontario 19.9°C
39 Kettle Point Ontario 19.9°C
40 Cherry Beach Ontario 19.9°C
41 Oakville Ontario 19.9°C
42 Toronto Islands Ontario 19.9°C
43 Toronto Ontario 19.9°C
44 Woodbine Beach Ontario 19.9°C
45 Ipperwash Beach Ontario 19.9°C
46 Lambton Shores Ontario 19.9°C
47 Pinery Ontario 19.9°C
48 Burlington Ontario 19.8°C
49 Grimsby Ontario 19.8°C
50 Hamilton Ontario 19.8°C

Coldest 10 in Canada in September

Same data the other way. Helpful if you want to know which Canada coasts to avoid for swimming in September.

# Location September mean
1 Alert Nunavut -1.6°C
2 Cape Sheridan Nunavut -1.6°C
3 Wrangel Bay Nunavut -1.6°C
4 Cameron Island Nunavut -1.5°C
5 Isachsen Nunavut -1.5°C
6 Discovery Harbour Nunavut -1.5°C
7 Airstrip Point Nunavut -1.3°C
8 Greely Fiord Nunavut -1.1°C
9 Iceberg Point Nunavut -1.0°C
10 Pim Island Nunavut -1.0°C

More on this region