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Warmest beach in Alaska in September

653 coastal locations in Alaska ranked by their typical September sea temperature. State-wide average in September: 11.2°C.

Warmest in September

Dewey Anchorage, Etolin Island, Alaska

13.5°C

State September average

11.2°C

across 653 coastal locations in Alaska

Vs annual mean

+3.8°C

above the year-round state average

What the Alaska 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.

Alaska monthly average 3.9°C to 12.5°C
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  • Warmest month August 12.5°C
  • Coldest month March 3.9°C
  • Annual mean 7.4°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.

Alaska sea temperature map (live)

Today's reading at every Alaska 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 Alaska beaches in September

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

# Location September mean
1 Dewey Anchorage, Etolin Island, Alaska Alaska 13.5°C
2 Entrance, Kasaan Bay, Alaska Alaska 13.5°C
3 Hadley, Lyman Anchorage, Alaska Alaska 13.5°C
4 Karta Bay, Kasaan Bay, Alaska Alaska 13.5°C
5 Kasaan, Kasaan Bay, Alaska Alaska 13.5°C
6 Lindeman Cove, Kasaan Bay Alaska 13.5°C
7 Magnetic Point, Union Bay, Earnest Sound Alaska 13.5°C
8 Menefee Anch., Prince of Wales Island, Alaska Alaska 13.5°C
9 Niblack Anchorage, Moira Sound, Alaska Alaska 13.5°C
10 Point Harrington, Clarence Strait Alaska 13.5°C
11 Ratz Harbor, Prince of Wales Island, Alaska Alaska 13.5°C
12 Steamer Bay, Etolin Island, Alaska Alaska 13.5°C
13 Thoms Point, Zimovia Strait Alaska 13.5°C
14 Union Bay, Ernest Sound, Alaska Alaska 13.5°C
15 Wrangell, Wrangell Island Alaska 13.5°C
16 Bell Arm, Bell Island, Alaska Alaska 13.4°C
17 Burrough Bay, Behm Canal Alaska 13.4°C
18 Burroughs Bay, Alaska Alaska 13.4°C
19 Convenient Cove, Hassler Island, Alaska Alaska 13.4°C
20 Loring, Naha Bay, Alaska Alaska 13.4°C
21 Traitors Cove (inside narrows), Alaska Alaska 13.4°C
22 Vallenar Point, Alaska Alaska 13.4°C
23 Yes Cannery, Yes Bay, Alaska Alaska 13.4°C
24 Wrangell Alaska 13.4°C
25 Surveyor Seamount Alaska 13.2°C
Show 25 more ▸
26 Nehenta Bay, Gravina Island, Alaska Alaska 13.1°C
27 Alava Bay, Alaska Alaska 13.0°C
28 Alva Bay, Revillagigedo Island, Alaska Alaska 13.0°C
29 Coon Island, George Inlet, Revillagigedo Channel, Alaska Alaska 13.0°C
30 Custom House Cove, Mary Island Alaska 13.0°C
31 Fitzgibbon Cove, Alaska Alaska 13.0°C
32 Gnat Cove, Carroll Inlet, Revillagigedo Channel, Alaska Alaska 13.0°C
33 Ketchikan, Tongass Narrows Alaska 13.0°C
34 Mary Island Anchorage, Revillagigedo Channel, Alaska Alaska 13.0°C
35 Mop Point, Thorne Arm, Revillagigedo Channel, Alaska Alaska 13.0°C
36 Nigelius Point, Carroll Inlet, Revillagigedo Channel, Alaska Alaska 13.0°C
37 Northern Carroll Inlet GPS Tide Buoy Alaska 13.0°C
38 Rudyerd Bay, Alaska Alaska 13.0°C
39 Tamgas Harbor, Annette Island, Alaska Alaska 13.0°C
40 Ward Cove, Revillagigedo Channel, Alaska Alaska 13.0°C
41 Barlow Cove, Mansfield Peninsula, Lynn Canal, Alaska Alaska 13.0°C
42 Falcon Arm, Slocum Arm, Chichagof Island, Alaska Alaska 13.0°C
43 Funter, Funter Bay, Lynn Canal, Alaska Alaska 13.0°C
44 Hoonah Harbor, Port Frederick, Alaska Alaska 13.0°C
45 Hoonah, Port Fredrick Alaska 13.0°C
46 Klokachef Island, Alaska Alaska 13.0°C
47 Lincoln Island, Lynn Canal, Alaska Alaska 13.0°C
48 Swanson Harbor, Icy Strait, Alaska Alaska 13.0°C
49 Whitestone Narrows, Neva Strait Alaska 13.0°C
50 Gilmer Bay, Kruzof Island, Alaska Alaska 13.0°C

Coldest 10 in Alaska in September

Same data the other way.

# Location September mean
1 Prudhoe Bay Alaska 2.6°C
2 Flaxman Island Alaska 2.7°C
3 Cross Island (Dinkum Sands) Alaska 2.9°C
4 Barter Island Alaska 3.0°C
5 Prudhoe Bay #2 Alaska 3.0°C
6 Barrow Alaska 3.3°C
7 Barrow (offshore) Alaska 3.9°C
8 Point Barrow, Alaska Alaska 3.9°C
9 Point Barrow Alaska 3.9°C
10 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 7.0°C

Other US states

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