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Warmest beach in Washington in September

187 coastal locations in Washington ranked by their typical September sea temperature. State-wide average in September: 12.3°C.

Warmest in September

Point Roberts

14.8°C

State September average

12.3°C

across 187 coastal locations in Washington

Vs annual mean

+2.0°C

above the year-round state average

What the Washington water 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.

Washington monthly average 8.1°C to 13.0°C
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  • Warmest month August 13.0°C
  • Coldest month February 8.1°C
  • Annual mean 10.3°C
  • Months above 20°C 0 of 12

Where September fits in the year

September sits inside the state pattern shown on the left. Browse a different month for a fresh ranking.

Washington sea temperature map (live)

Today's reading at every Washington beach we track. The list below uses the typical September mean from a decade of daily history.

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 Washington beaches in September

Sorted by typical September mean. Click any beach for the full location page.

# Location September mean
1 Point Roberts Washington 14.8°C
2 Columbia River entrance (N. Jetty), Washington Washington 14.8°C
3 Fort Canby, Jetty 'A', Washington Washington 14.8°C
4 Ilwaco, Baker Bay, Washington Washington 14.8°C
5 Bay Center, Palix River, Willapa Bay, Washington Washington 14.6°C
6 Mailboat Slough, Willapa River, Willapa Bay, Washington Washington 14.6°C
7 Palix River, south fork, Willapa Bay, Washington Washington 14.6°C
8 Raymond, Willapa River, Willapa Bay, Washington Washington 14.6°C
9 South Bend, Willapa River, Willapa Bay Washington 14.6°C
10 Toke Point, Willapa Bay Washington 14.6°C
11 Long Beach Washington 14.6°C
12 Ocean Park Washington 14.6°C
13 Cape Disappointment Washington 14.5°C
14 Aberdeen, Grays Harbor Washington 14.4°C
15 Bay City, South Bay, Grays Harbor, Washington Washington 14.4°C
16 Cosmopolis, Chehalis River, Grays Harbor, Washington Washington 14.4°C
17 Markham, Grays Harbor, Washington Washington 14.4°C
18 Montesano, Chehalis River, Grays Harbor, Washington Washington 14.4°C
19 Point Brown, Grays Harbor, Washington Washington 14.4°C
20 Westport, Point Chehalis, Grays Harbor Washington 14.4°C
21 Aberdeen Washington 14.3°C
22 Hoquiam Washington 14.3°C
23 Moclips Washington 14.3°C
24 Ocean City Washington 14.3°C
25 Ocean Shores Washington 14.3°C
Show 25 more ▸
26 Westport Washington 14.2°C
27 Anacortes Washington 14.1°C
28 Bellingham Washington 14.1°C
29 Birch Bay Washington 14.1°C
30 Blaine Washington 14.1°C
31 Eastsound Washington 14.1°C
32 Lopez Island Washington 14.1°C
33 Marietta Washington 14.1°C
34 Olga Washington 14.1°C
35 Orcas Island Washington 14.1°C
36 Anacortes, Guemes Channel, Washington Washington 14.1°C
37 Armitage Island, Thatcher Pass Washington 14.1°C
38 Bellingham, Bellingham Bay, Washington Washington 14.1°C
39 Cherry Point, Strait of Georgia Washington 14.1°C
40 Chuckanut Bay, Bellingham Bay, Washington Washington 14.1°C
41 Drayton Harbor, Blaine, Strait of Georgia Washington 14.1°C
42 Eagle Harbor, Cypress Island, Washington Washington 14.1°C
43 Echo Bay, Sucia Islands, Strait of Georgia, Washington Washington 14.1°C
44 Ferndale, Strait of Georgia, Washington Washington 14.1°C
45 Gooseberry Point, Hale Passage, Washington Washington 14.1°C
46 Orcas, Orcas Island, Washington Washington 14.1°C
47 Patos Island Wharf, Boundary Pass, Washington Washington 14.1°C
48 Peavine Pass, Washington Washington 14.1°C
49 Point Migley, Hale Passage, Washington Washington 14.1°C
50 Sandy Point, Lummi Bay, Washington Washington 14.1°C

Coldest 10 in Washington in September

Same data the other way.

# Location September mean
1 Twin Rivers, Strait of Juan de Fuca, Washington Washington 10.6°C
2 Jim Creek Washington 10.7°C
3 Crescent Bay, Strait of Juan de Fuca, Washington Washington 10.7°C
4 Sekiu, Clallam Bay, Strait of Juan de Fuca Washington 11.0°C
5 Ediz Hook, Port Angeles, Strait of Juan de Fuca, Washington Washington 11.1°C
6 Port Angeles, Strait Of Juan De Fuca Washington 11.1°C
7 Port Angeles Washington 11.1°C
8 Admiralty Head, Admiralty Inlet, Washington Washington 11.2°C
9 Bremerton, Sinclair Inlet, Port Orchard, Puget Sound Washington 11.2°C
10 Brownsville, Port Orchard Washington 11.2°C

Other US states

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