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Coldest sea in Canada in September

829 coastal locations in Canada ranked by typical September sea temperature, coldest first. Region-wide average in September: 12.9°C.

Coldest in September

Alert

-1.6°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.

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 coldest Canada locations in September

Sorted by typical September mean from a decade of daily readings, coldest first. Click any place for the full location page.

# 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
11 Entrance Island Nunavut -0.8°C
12 Baffin Nunavut -0.7°C
13 Hamilton Island Nunavut -0.6°C
14 Little Cornwallis Island Nunavut -0.6°C
15 Winter Harbour Northwest Territories -0.6°C
16 Purfur Cove Nunavut -0.6°C
17 Dease Peninsula Nunavut -0.5°C
18 Cape Barclay Nunavut -0.5°C
19 Cape Capel Nunavut -0.5°C
20 Peel Point Northwest Territories -0.4°C
21 Crown Prince Frederick Nunavut -0.3°C
22 Crown Prince Frederick Island Nunavut -0.3°C
23 Bay of Woe Nunavut -0.3°C
24 Cape Sibbald Nunavut -0.1°C
25 Natkusiak Peninsula Northwest Territories -0.1°C
Show 25 more ▸
26 Resolute Nunavut 0.0°C
27 Cape Skogn Nunavut 0.1°C
28 Cape Kater Nunavut 0.1°C
29 Grise Fiord Nunavut 0.2°C
30 False Strait Nunavut 0.3°C
31 Beechey Island Nunavut 0.4°C
32 Erebus Bay Nunavut 0.4°C
33 Radstock Bay Nunavut 0.5°C
34 Rigby Bay Nunavut 0.5°C
35 Bonne Island Nunavut 0.7°C
36 Fury Point Nunavut 0.9°C
37 Bellot Strait East Nunavut 0.9°C
38 Fort Ross Nunavut 0.9°C
39 Dundas Harbour Nunavut 0.9°C
40 Arctic Bay Nunavut 1.1°C
41 Lavoie Islands (Bernier Bay) Nunavut 1.1°C
42 King Charles Cape Nunavut 1.2°C
43 Martin Islands Nunavut 1.2°C
44 Sévigny Point Nunavut 1.4°C
45 Frobisher's Farthest Nunavut 1.4°C
46 Lewis Bay Nunavut 1.4°C
47 Resor Island Nunavut 1.4°C
48 Iqaluit (Frobisher Bay) Nunavut 1.5°C
49 Iqaluit Nunavut 1.5°C
50 Repulse Bay Nunavut 1.6°C

Warmest 10 in Canada in September

Same data the other way. The warmest spots for the same month.

# 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

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