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Warmest beach in Alaska

653 coastal locations in Alaska ranked by year-round average sea temperature. The state-wide average is 7.4°C. The peak month is August at 12.5°C. Click any beach for its 30-day chart and 10-year history.

Warmest year-round

Ketchikan

9.7°C annual mean

State-wide average

7.4°C

across 653 Alaska coastal locations

Warmest month

August

12.5°C state-wide average

What the water feels like at peak in August

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

Month by month around the Alaska coast

Alaska sea temperatures swing from 3.9°C in March to 12.5°C in August on average across the coast. That's a spread of 9°C. Pick a single month for a focused ranking:

Alaska sea temperature map

Today's pin colours show the latest daily reading at every Alaska beach we track. Drag and zoom; click any pin for that beach's full page.

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 beaches in Alaska

Sorted by year-round average. Click any beach for its 30-day chart, monthly profile, and 10-year history.

# Location Annual mean
1 Ketchikan Alaska 9.7°C
2 Dewey Anchorage, Etolin Island, Alaska Alaska 9.7°C
3 Entrance, Kasaan Bay, Alaska Alaska 9.7°C
4 Hadley, Lyman Anchorage, Alaska Alaska 9.7°C
5 Karta Bay, Kasaan Bay, Alaska Alaska 9.7°C
6 Kasaan, Kasaan Bay, Alaska Alaska 9.7°C
7 Lindeman Cove, Kasaan Bay Alaska 9.7°C
8 Magnetic Point, Union Bay, Earnest Sound Alaska 9.7°C
9 Menefee Anch., Prince of Wales Island, Alaska Alaska 9.7°C
10 Niblack Anchorage, Moira Sound, Alaska Alaska 9.7°C
11 Point Harrington, Clarence Strait Alaska 9.7°C
12 Ratz Harbor, Prince of Wales Island, Alaska Alaska 9.7°C
13 Steamer Bay, Etolin Island, Alaska Alaska 9.7°C
14 Thoms Point, Zimovia Strait Alaska 9.7°C
15 Union Bay, Ernest Sound, Alaska Alaska 9.7°C
16 Wrangell, Wrangell Island Alaska 9.7°C
17 Wrangell Alaska 9.7°C
18 Bell Arm, Bell Island, Alaska Alaska 9.7°C
19 Burrough Bay, Behm Canal Alaska 9.7°C
20 Burroughs Bay, Alaska Alaska 9.7°C
21 Convenient Cove, Hassler Island, Alaska Alaska 9.7°C
22 Halibut Bay, Alaska Alaska 9.7°C
23 Loring, Naha Bay, Alaska Alaska 9.7°C
24 Nakat Harbor, Dixon Entrance, Alaska Alaska 9.7°C
25 Port Tongass, Tongass Island, Dixon Entrance, Alaska Alaska 9.7°C
Show 25 more ▸
26 Traitors Cove (inside narrows), Alaska Alaska 9.7°C
27 Vallenar Point, Alaska Alaska 9.7°C
28 Yes Cannery, Yes Bay, Alaska Alaska 9.7°C
29 Alava Bay, Alaska Alaska 9.7°C
30 Alva Bay, Revillagigedo Island, Alaska Alaska 9.7°C
31 Custom House Cove, Mary Island Alaska 9.7°C
32 Fitzgibbon Cove, Alaska Alaska 9.7°C
33 Gnat Cove, Carroll Inlet, Revillagigedo Channel, Alaska Alaska 9.7°C
34 Mary Island Anchorage, Revillagigedo Channel, Alaska Alaska 9.7°C
35 Mop Point, Thorne Arm, Revillagigedo Channel, Alaska Alaska 9.7°C
36 Nigelius Point, Carroll Inlet, Revillagigedo Channel, Alaska Alaska 9.7°C
37 Northern Carroll Inlet GPS Tide Buoy Alaska 9.7°C
38 Rudyerd Bay, Alaska Alaska 9.7°C
39 Boca de Quadra, Revillagigedo Channel, Alaska Alaska 9.7°C
40 Cape Fox, Dixon Entrance, Alaska Alaska 9.7°C
41 Davis River entrance, Alaska Alaska 9.7°C
42 Kah Shakes Cove, Revillagigedo Channel, Alaska Alaska 9.7°C
43 Smeaton Bay (Wilson Arm), Alaska Alaska 9.7°C
44 Coon Island, George Inlet, Revillagigedo Channel, Alaska Alaska 9.7°C
45 Ketchikan, Tongass Narrows Alaska 9.7°C
46 Metlakatla Alaska 9.7°C
47 Nehenta Bay, Gravina Island, Alaska Alaska 9.7°C
48 Tamgas Harbor, Annette Island, Alaska Alaska 9.7°C
49 Ward Cove, Revillagigedo Channel, Alaska Alaska 9.7°C
50 Barren Island, Dixon Entrance, Alaska Alaska 9.7°C

Coldest 10 in Alaska

Same data, sorted the other way.

# Location Annual mean
1 Prudhoe Bay #2 Alaska -0.3°C
2 Prudhoe Bay Alaska -0.3°C
3 Flaxman Island Alaska -0.3°C
4 Cross Island (Dinkum Sands) Alaska -0.3°C
5 Barrow Alaska -0.2°C
6 Barter Island Alaska -0.1°C
7 Barrow (offshore) Alaska 0.1°C
8 Point Barrow, Alaska Alaska 0.1°C
9 Point Barrow Alaska 0.1°C
10 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 1.5°C

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