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Coldest sea in United States in April

4,477 coastal locations in United States ranked by typical April sea temperature, coldest first. Region-wide average in April: 13.5°C.

Coldest in April

Point Hope

-1.7°C April mean in United States

Regional April average

13.5°C

across all 4,477 coastal locations in United States

Vs annual mean

-2.7°C

below the year-round regional average

What the United States sea feels like in April

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.

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 April fits in the year

April 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 April 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 April

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

# Location April mean
1 Point Hope Alaska -1.7°C
2 Barrow Alaska -1.6°C
3 Cape Krusenstern, Kotzebue Sound Alaska -1.6°C
4 Kivalina Alaska -1.6°C
5 Northeast Cape, St. Lawrence Island Alaska -1.6°C
6 Flaxman Island Alaska -1.6°C
7 Fossil River entrance, St. Lawrence Island, Alaska Alaska -1.6°C
8 Outside Lopp Lagoon Alaska -1.6°C
9 Savoonga, St. Lawrence Island Alaska -1.6°C
10 Tin City, Bering Sea Alaska -1.6°C
11 Cape Espenberg, Kotzebue Sound Alaska -1.6°C
12 Red Dog Dock Alaska -1.6°C
13 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska -1.6°C
14 Shishmaref Inlet 2 Alaska -1.6°C
15 Kotzebue, Kotzebue Sound Alaska -1.6°C
16 Prudhoe Bay #2 Alaska -1.6°C
17 Barrow (offshore) Alaska -1.6°C
18 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska -1.6°C
19 Nome, Norton Sound Alaska -1.6°C
20 Powooiliak Point, St. Lawrence Island, Alaska Alaska -1.6°C
21 Akeftapak, St. Lawrence Island Alaska -1.6°C
22 Barter Island Alaska -1.6°C
23 Point Barrow, Alaska Alaska -1.5°C
24 Point Barrow Alaska -1.5°C
25 Prudhoe Bay Alaska -1.5°C
Show 25 more ▸
26 Goodhope Bay, Kotzebue Sound Alaska -1.5°C
27 Lost River, Seward Peninsula Alaska -1.5°C
28 Deering, Kotzebue Sound Alaska -1.5°C
29 Cross Island (Dinkum Sands) Alaska -1.5°C
30 Kotzebue Alaska -1.5°C
31 Point Spencer, Port Clarence, Norton Sound Alaska -1.5°C
32 Mekoryuk, Mekoryuk River Entrance Alaska -1.5°C
33 Teller, Port Clarance, Norton Sound, Alaska Alaska -1.4°C
34 Teller, Port Clarence Alaska -1.4°C
35 Tooksook Bay, Nelson Island Alaska -1.4°C
36 Kiwalik, Kotzebue Sound, Alaska Alaska -1.4°C
37 Fort Peck Lake Montana -1.4°C
38 Cape Romanzof, Bering Sea, Alaska Alaska -1.4°C
39 Dall Point, Hooper Bay Alaska -1.4°C
40 Eastern Nunivak Island Alaska -1.4°C
41 Kokechik Bay, Bering Sea, Alaska Alaska -1.4°C
42 Black, Black River, Bering Sea, Alaska Alaska -1.4°C
43 Nunam Iqua (Sheldon Point) Alaska -1.4°C
44 Nome Alaska -1.4°C
45 St. Matthew Island, Bering Sea, Alaska Alaska -1.3°C
46 Carolyn Island, Golovnin Bay, Alaska Alaska -1.3°C
47 Carolyn Island, Golovnin Bay, Norton Sound, Alaska Alaska -1.3°C
48 Lake Sakakawea North Dakota -1.3°C
49 Apoon Mouth, Yukon River, Norton Sound, Alaska Alaska -1.3°C
50 North Bay, Stuart Island, Norton Sound, Alaska Alaska -1.3°C

Warmest 10 in United States in April

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

# Location April mean
1 Howland Island Minor Outlying Islands 28.2°C
2 Palmyra Island Northern Line Islands 28.1°C
3 Jarvis Island Minor Outlying Islands 27.5°C
4 Wake Island, Pacific Ocean Minor Outlying Islands 26.7°C
5 Carysfort Reef, Florida Florida 26.4°C
6 Key Largo Florida 26.3°C
7 Molasses Reef Florida 26.3°C
8 Pennekamp Florida 26.3°C
9 Rodriguez Key Florida 26.3°C
10 Boynton Beach, Lake Worth Florida 26.3°C

More on this region