Coldest sea in North America in September

5,500 coastal locations in North America ranked by typical September sea temperature, coldest first. Region-wide average in September: 20.5°C.

Coldest in September

Alert

-1.6°C September mean in Canada

Regional September average

20.5°C

across all 5,500 coastal locations in North America

Vs annual mean

+5.3°C

above the year-round regional average

What the North America sea feels like in September

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

North America monthly average 9.3°C to 21.6°C

Warmest month August 21.6°C
Coldest month February 9.3°C
Annual mean 15.2°C
Months above 20°C 3 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 North America month rankings:

North America sea temperature map (live)

The map shows today's latest reading at every North America 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 North America 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	Country	September mean
1	Alert Nunavut	Canada	-1.6°C
2	Cape Sheridan Nunavut	Canada	-1.6°C
3	Wrangel Bay Nunavut	Canada	-1.6°C
4	Cameron Island Nunavut	Canada	-1.5°C
5	Isachsen Nunavut	Canada	-1.5°C
6	Discovery Harbour Nunavut	Canada	-1.5°C
7	Airstrip Point Nunavut	Canada	-1.3°C
8	Greely Fiord Nunavut	Canada	-1.1°C
9	Iceberg Point Nunavut	Canada	-1.0°C
10	Pim Island Nunavut	Canada	-1.0°C
11	Entrance Island Nunavut	Canada	-0.8°C
12	Baffin Nunavut	Canada	-0.7°C
13	Hamilton Island Nunavut	Canada	-0.6°C
14	Little Cornwallis Island Nunavut	Canada	-0.6°C
15	Winter Harbour Northwest Territories	Canada	-0.6°C
16	Purfur Cove Nunavut	Canada	-0.6°C
17	Dease Peninsula Nunavut	Canada	-0.5°C
18	Cape Barclay Nunavut	Canada	-0.5°C
19	Cape Capel Nunavut	Canada	-0.5°C
20	Peel Point Northwest Territories	Canada	-0.4°C
21	Crown Prince Frederick Nunavut	Canada	-0.3°C
22	Crown Prince Frederick Island Nunavut	Canada	-0.3°C
23	Bay of Woe Nunavut	Canada	-0.3°C
24	Cape Sibbald Nunavut	Canada	-0.1°C
25	Natkusiak Peninsula Northwest Territories	Canada	-0.1°C

Show 25 more ▸

26	Resolute Nunavut	Canada	0.0°C
27	Cape Skogn Nunavut	Canada	0.1°C
28	Cape Kater Nunavut	Canada	0.1°C
29	Grise Fiord Nunavut	Canada	0.2°C
30	False Strait Nunavut	Canada	0.3°C
31	Beechey Island Nunavut	Canada	0.4°C
32	Erebus Bay Nunavut	Canada	0.4°C
33	Radstock Bay Nunavut	Canada	0.5°C
34	Rigby Bay Nunavut	Canada	0.5°C
35	Bonne Island Nunavut	Canada	0.7°C
36	Fury Point Nunavut	Canada	0.9°C
37	Bellot Strait East Nunavut	Canada	0.9°C
38	Fort Ross Nunavut	Canada	0.9°C
39	Dundas Harbour Nunavut	Canada	0.9°C
40	Arctic Bay Nunavut	Canada	1.1°C
41	Lavoie Islands (Bernier Bay) Nunavut	Canada	1.1°C
42	King Charles Cape Nunavut	Canada	1.2°C
43	Martin Islands Nunavut	Canada	1.2°C
44	Sévigny Point Nunavut	Canada	1.4°C
45	Frobisher's Farthest Nunavut	Canada	1.4°C
46	Lewis Bay Nunavut	Canada	1.4°C
47	Resor Island Nunavut	Canada	1.4°C
48	Iqaluit (Frobisher Bay) Nunavut	Canada	1.5°C
49	Iqaluit Nunavut	Canada	1.5°C
50	Repulse Bay Nunavut	Canada	1.6°C

Warmest 10 in North America in September

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

#	Location	Country	September mean
1	San Felipe Baja California	Mexico	30.8°C
2	Teacapan Sinaloa	Mexico	30.8°C
3	Los Ayala Nayarit	Mexico	30.7°C
4	Rincon de Guayabitos Nayarit	Mexico	30.7°C
5	San Blas Nayarit	Mexico	30.7°C
6	Lake Pleasant Arizona	United States	30.6°C
7	Lake Powell Arizona	United States	30.6°C
8	Phoenix Arizona	United States	30.6°C
9	Campeche Campeche	Mexico	30.6°C
10	Bucerias Nayarit	Mexico	30.6°C