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Warmest sea in North America in September

5,500 coastal locations in North America ranked by their typical September sea temperature. Region-wide average in September: 20.5°C. The top of the list is where to find the warmest swimming this month.

Warmest in September

San Felipe

30.8°C September mean in Mexico

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
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  • 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, 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 North America 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 San Felipe Baja California 30.8°C
2 Teacapan Sinaloa 30.8°C
3 Los Ayala Nayarit 30.7°C
4 Rincon de Guayabitos Nayarit 30.7°C
5 San Blas Nayarit 30.7°C
6 Lake Pleasant Arizona 30.6°C
7 Lake Powell Arizona 30.6°C
8 Phoenix Arizona 30.6°C
9 Campeche Campeche 30.6°C
10 Bucerias Nayarit 30.6°C
11 Lo de Marcos Nayarit 30.6°C
12 Riviera Nayarit Nayarit 30.6°C
13 San Pancho Nayarit 30.6°C
14 Sayulita Nayarit 30.6°C
15 Puerto Chiapas Chiapas 30.5°C
16 Seybaplaya Campeche 30.5°C
17 Puerto Arista Chiapas 30.5°C
18 Bahia de Banderas Nayarit 30.5°C
19 Camahuiroa Sonora 30.5°C
20 Nuevo Vallarta Nayarit 30.5°C
21 Denver Colorado 30.5°C
22 La Reforma Sinaloa 30.4°C
23 Punta Mita Nayarit 30.4°C
24 Los Mochis 30.4°C
25 Mazatlan Sinaloa 30.4°C
Show 25 more ▸
26 Puerto Vallarta Jalisco 30.4°C
27 Yelapa Jalisco 30.4°C
28 Las Cruces New Mexico 30.4°C
29 Puertecitos Baja California 30.4°C
30 Cospita Sinaloa 30.4°C
31 Tecoanapa Guerrero 30.4°C
32 Bacalar Quintana Roo 30.4°C
33 Calderitas Quintana Roo 30.4°C
34 Chetumal Quintana Roo 30.4°C
35 Quentin Quintana Roo 30.4°C
36 Altata Sinaloa 30.3°C
37 Yavaros Sonora 30.3°C
38 Acapulco Guerrero 30.3°C
39 Maldonado Guerrero 30.3°C
40 Puerto Penasco Sonora 30.3°C
41 Topolobampo Sinaloa 30.3°C
42 Acapulco-C,Gro. Guerrero 30.3°C
43 Bahia Kino Sonora 30.3°C
44 Brisas de Zicatela Oaxaca 30.3°C
45 Puerto Escondido Oaxaca 30.3°C
46 Sawyer Key, inside, Cudjoe Channel, Florida Florida 30.3°C
47 Sawyer Key, outside, Cudjoe Channel, Florida Florida 30.3°C
48 Sawyer Key Florida 30.3°C
49 Mazunte Oaxaca 30.3°C
50 San Agustinillo Oaxaca 30.3°C

Coldest 10 in North America in September

Same data the other way. Helpful if you want to know which North America 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