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Coldest sea in United States in August

4,477 coastal locations in United States ranked by typical August sea temperature, coldest first. Region-wide average in August: 22.6°C.

Coldest in August

Barrow

3.3°C August mean in United States

Regional August average

22.6°C

across all 4,477 coastal locations in United States

Vs annual mean

+6.4°C

above the year-round regional average

What the United States sea feels like in August

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.

United States monthly average 10.0°C to 22.6°C
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  • Warmest month August 22.6°C
  • Coldest month February 10.0°C
  • Annual mean 16.2°C
  • Months above 20°C 3 of 12

Where August fits in the year

August sits inside the regional pattern shown on the left. Pick a different month to see how the ranking shifts.

All twelve United States month rankings:

United States sea temperature map (live)

The map shows today's latest reading at every United States location. The list below is based on the typical August mean.

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 United States locations in August

Sorted by typical August mean from a decade of daily readings, coldest first. Click any place for the full location page.

# Location August mean
1 Barrow Alaska 3.3°C
2 Prudhoe Bay Alaska 3.9°C
3 Flaxman Island Alaska 3.9°C
4 Cross Island (Dinkum Sands) Alaska 4.2°C
5 Prudhoe Bay #2 Alaska 4.2°C
6 Barter Island Alaska 4.3°C
7 Barrow (offshore) Alaska 4.8°C
8 Point Barrow, Alaska Alaska 4.9°C
9 Point Barrow Alaska 4.9°C
10 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 7.5°C
11 Northeast Cape, St. Lawrence Island Alaska 7.6°C
12 Savoonga, St. Lawrence Island Alaska 7.7°C
13 Fossil River entrance, St. Lawrence Island, Alaska Alaska 7.8°C
14 St. Matthew Island, Bering Sea, Alaska Alaska 7.8°C
15 Amukta Island, north side, Aleutian Islands, Alaska Alaska 8.0°C
16 Powooiliak Point, St. Lawrence Island, Alaska Alaska 8.0°C
17 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska 8.2°C
18 Akeftapak, St. Lawrence Island Alaska 8.2°C
19 Applegate Cove, Chuginadak Island, Aleutian Islands, Alaska Alaska 8.2°C
20 Ogliuga Island (east coast), Delarof Islands, Alaska Alaska 8.2°C
21 East Cove, Yunaska Island, Alaska Alaska 8.4°C
22 North side, Yunaska Island, Alaska Alaska 8.4°C
23 Lash Bay, Tanaga Island, Alaska Alaska 8.4°C
24 Gareloi Island, Delarof Islands, Alaska Alaska 8.4°C
25 Finch Cove, Seguam Island, Aleutian Islands, Alaska Alaska 8.5°C
Show 25 more ▸
26 Hot Springs Bay, Tanaga Island, Alaska Alaska 8.5°C
27 Tanaga Bay, Tanaga Island, Alaska Alaska 8.5°C
28 Outside Lopp Lagoon Alaska 8.6°C
29 Constantine Harbor, Amchitka Island, Rat Islands, Alaska Alaska 8.6°C
30 Constantine Harbour Alaska 8.6°C
31 South Bight, Amchitka Island, Rat Islands, Alaska Alaska 8.6°C
32 Cape Chunu, Kanaga Island, Alaska Alaska 8.7°C
33 Kiska Harbor, Kiska Island, Rat Islands, Alaska Alaska 8.7°C
34 Ulak Island, Delarof Islands, Alaska Alaska 8.7°C
35 Gertrude Cove, Kiska Island, Rat Islands, Alaska Alaska 8.7°C
36 Herbert Island, west side, Aleutian Islands, Alaska Alaska 8.8°C
37 Okee Bay, Umnak Island, Alaska Alaska 8.8°C
38 Inanudak Bay, Umnak Island, Alaska Alaska 8.8°C
39 Shoal Point, Kanaga Island, Alaska Alaska 8.9°C
40 Cape Chlanak, Kanaga Island, Alaska Alaska 9.0°C
41 Kanaga Bay, Kanaga Island, Alaska Alaska 9.0°C
42 Point Hope Alaska 9.0°C
43 Three Arm Bay, Adak Island, Alaska Alaska 9.0°C
44 Unalga Bight, Adak Island, Alaska Alaska 9.0°C
45 Otter Point, Umnak Island, Alaska Alaska 9.1°C
46 Akutan Harbor, Akutan Island, Aleutian Islands, Alaska Alaska 9.1°C
47 Andrew Bay, Adak Island, Alaska Alaska 9.1°C
48 Broad Bight, Akutan Island, Aleutian Islands Alaska 9.1°C
49 Sweeper Cove, Adak Island Alaska 9.1°C
50 Adugak Island, Aleutian Islands, Alaska Alaska 9.1°C

Warmest 10 in United States in August

Same data the other way. The warmest spots for the same month.

# Location August mean
1 Lake Pleasant Arizona 31.5°C
2 Lake Powell Arizona 31.5°C
3 Phoenix Arizona 31.5°C
4 Denver Colorado 31.2°C
5 Lostmans River entrance, Florida Florida 31.1°C
6 Onion Key Bay Florida 31.1°C
7 Onion Key, Lostmans River, Florida Florida 31.1°C
8 Shark River entrance, Florida Florida 31.1°C
9 Cape Sable, East Cape, Florida Florida 31.0°C
10 Flamingo, Florida Bay, Florida Florida 31.0°C

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