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Coldest sea in United States in July

4,477 coastal locations in United States ranked by typical July sea temperature, coldest first. Region-wide average in July: 22.2°C.

Coldest in July

Prudhoe Bay #2

-0.3°C July mean in United States

Regional July average

22.2°C

across all 4,477 coastal locations in United States

Vs annual mean

+6.0°C

above the year-round regional average

What the United States sea feels like in July

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 July fits in the year

July 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 July 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 July

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

# Location July mean
1 Prudhoe Bay #2 Alaska -0.3°C
2 Cross Island (Dinkum Sands) Alaska -0.1°C
3 Prudhoe Bay Alaska 0.1°C
4 Barrow Alaska 0.4°C
5 Point Barrow, Alaska Alaska 0.7°C
6 Point Barrow Alaska 0.7°C
7 Barrow (offshore) Alaska 0.7°C
8 Flaxman Island Alaska 0.8°C
9 Barter Island Alaska 1.8°C
10 Lake Sakakawea North Dakota 3.5°C
11 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 5.9°C
12 Northeast Cape, St. Lawrence Island Alaska 5.9°C
13 Fort Peck Lake Montana 6.0°C
14 St. Matthew Island, Bering Sea, Alaska Alaska 6.0°C
15 Fossil River entrance, St. Lawrence Island, Alaska Alaska 6.2°C
16 Savoonga, St. Lawrence Island Alaska 6.4°C
17 Akeftapak, St. Lawrence Island Alaska 6.6°C
18 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska 6.7°C
19 Powooiliak Point, St. Lawrence Island, Alaska Alaska 6.7°C
20 Gareloi Island, Delarof Islands, Alaska Alaska 7.0°C
21 Ogliuga Island (east coast), Delarof Islands, Alaska Alaska 7.0°C
22 Point Hope Alaska 7.1°C
23 Outside Lopp Lagoon Alaska 7.1°C
24 Applegate Cove, Chuginadak Island, Aleutian Islands, Alaska Alaska 7.1°C
25 Lash Bay, Tanaga Island, Alaska Alaska 7.2°C
Show 25 more ▸
26 Amukta Island, north side, Aleutian Islands, Alaska Alaska 7.2°C
27 Hot Springs Bay, Tanaga Island, Alaska Alaska 7.2°C
28 Tanaga Bay, Tanaga Island, Alaska Alaska 7.3°C
29 Constantine Harbor, Amchitka Island, Rat Islands, Alaska Alaska 7.3°C
30 Constantine Harbour Alaska 7.3°C
31 East Cove, Yunaska Island, Alaska Alaska 7.3°C
32 North side, Yunaska Island, Alaska Alaska 7.3°C
33 South Bight, Amchitka Island, Rat Islands, Alaska Alaska 7.3°C
34 Kiska Harbor, Kiska Island, Rat Islands, Alaska Alaska 7.3°C
35 Cape Chunu, Kanaga Island, Alaska Alaska 7.3°C
36 Gertrude Cove, Kiska Island, Rat Islands, Alaska Alaska 7.4°C
37 Shoal Point, Kanaga Island, Alaska Alaska 7.4°C
38 Village Cove, St. Paul Island, Bering Sea Alaska 7.4°C
39 Ulak Island, Delarof Islands, Alaska Alaska 7.4°C
40 Finch Cove, Seguam Island, Aleutian Islands, Alaska Alaska 7.5°C
41 Three Arm Bay, Adak Island, Alaska Alaska 7.5°C
42 Unalga Bight, Adak Island, Alaska Alaska 7.5°C
43 Andrew Bay, Adak Island, Alaska Alaska 7.5°C
44 Cape Chlanak, Kanaga Island, Alaska Alaska 7.5°C
45 Herbert Island, west side, Aleutian Islands, Alaska Alaska 7.5°C
46 Kanaga Bay, Kanaga Island, Alaska Alaska 7.5°C
47 Sweeper Cove, Adak Island Alaska 7.5°C
48 Adak Bight, Adak Island, Alaska Alaska 7.6°C
49 Cemetery Point, Kagalaska Island, Aleutian Islands, Alaska Alaska 7.6°C
50 Fenimore Pass, Aleutian Islands, Alaska Alaska 7.6°C

Warmest 10 in United States in July

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

# Location July mean
1 Apollo Beach Florida 30.8°C
2 Bayshore Gardens Florida 30.8°C
3 Bradenton Florida 30.8°C
4 Coquina Beach Florida 30.8°C
5 Cortez Florida 30.8°C
6 Cypress Point Park Florida 30.8°C
7 Feather Sound Florida 30.8°C
8 Gandy Florida 30.8°C
9 Gibsonton Florida 30.8°C
10 Gulf Gate Estates Florida 30.8°C

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