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Coldest 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.

Coldest in September

Prudhoe Bay

2.6°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 coldest Alaska beaches in September

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

# Location September mean
1 Chernofski Harbor, Unalaska Island, Alaska Alaska 8.5°C
2 Kigul Island, Umnak Island, Alaska Alaska 8.5°C
3 Skan Bay, Unalaska Island, Alaska Alaska 8.4°C
4 Adugak Island, Aleutian Islands, Alaska Alaska 8.4°C
5 Adugak Islands, Umnak Island, Alaska Alaska 8.4°C
6 Cape Sagak, Umnak Island, Alaska Alaska 8.4°C
7 Lost River, Seward Peninsula Alaska 8.4°C
8 Hot Springs Bay, Tanaga Island, Alaska Alaska 8.4°C
9 Otter Point, Umnak Island, Alaska Alaska 8.4°C
10 Red Dog Dock Alaska 8.4°C
11 Cape Chunu, Kanaga Island, Alaska Alaska 8.4°C
12 Constantine Harbor, Amchitka Island, Rat Islands, Alaska Alaska 8.3°C
13 Constantine Harbour Alaska 8.3°C
14 South Bight, Amchitka Island, Rat Islands, Alaska Alaska 8.3°C
15 Inanudak Bay, Umnak Island, Alaska Alaska 8.3°C
16 Okee Bay, Umnak Island, Alaska Alaska 8.3°C
17 Gareloi Island, Delarof Islands, Alaska Alaska 8.3°C
18 Cape Espenberg, Kotzebue Sound Alaska 8.2°C
19 Tanaga Bay, Tanaga Island, Alaska Alaska 8.2°C
20 Finch Cove, Seguam Island, Aleutian Islands, Alaska Alaska 8.1°C
21 Ulak Island, Delarof Islands, Alaska Alaska 8.1°C
22 Kivalina Alaska 8.1°C
23 Herbert Island, west side, Aleutian Islands, Alaska Alaska 8.1°C
24 Tin City, Bering Sea Alaska 8.0°C
25 Lash Bay, Tanaga Island, Alaska Alaska 8.0°C
Show 25 more ▸
26 Shishmaref Inlet 2 Alaska 8.0°C
27 Ogliuga Island (east coast), Delarof Islands, Alaska Alaska 7.8°C
28 Outside Lopp Lagoon Alaska 7.8°C
29 Applegate Cove, Chuginadak Island, Aleutian Islands, Alaska Alaska 7.7°C
30 East Cove, Yunaska Island, Alaska Alaska 7.7°C
31 North side, Yunaska Island, Alaska Alaska 7.7°C
32 Point Hope Alaska 7.7°C
33 St. Matthew Island, Bering Sea, Alaska Alaska 7.6°C
34 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska 7.4°C
35 Akeftapak, St. Lawrence Island Alaska 7.3°C
36 Amukta Island, north side, Aleutian Islands, Alaska Alaska 7.3°C
37 Powooiliak Point, St. Lawrence Island, Alaska Alaska 7.2°C
38 Fossil River entrance, St. Lawrence Island, Alaska Alaska 7.1°C
39 Northeast Cape, St. Lawrence Island Alaska 7.0°C
40 Savoonga, St. Lawrence Island Alaska 7.0°C
41 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 7.0°C
42 Point Barrow, Alaska Alaska 3.9°C
43 Point Barrow Alaska 3.9°C
44 Barrow (offshore) Alaska 3.9°C
45 Barrow Alaska 3.3°C
46 Barter Island Alaska 3.0°C
47 Prudhoe Bay #2 Alaska 3.0°C
48 Cross Island (Dinkum Sands) Alaska 2.9°C
49 Flaxman Island Alaska 2.7°C
50 Prudhoe Bay Alaska 2.6°C

Warmest 10 in Alaska in September

Same data flipped. The warmest spots in the state for this month.

# 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

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