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Coldest sea in United States in October

4,477 coastal locations in United States ranked by typical October sea temperature, coldest first. Region-wide average in October: 18.8°C.

Coldest in October

Barter Island

0.3°C October mean in United States

Regional October average

18.8°C

across all 4,477 coastal locations in United States

Vs annual mean

+2.6°C

above the year-round regional average

What the United States sea feels like in October

At this temperature, water will feel cold compared to a swimming pool, but with a bit of experience and practice most people will find the water relatively comfortable to swim in.

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 October fits in the year

October 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 October 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 October

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

# Location October mean
1 Barter Island Alaska 0.3°C
2 Prudhoe Bay Alaska 0.5°C
3 Flaxman Island Alaska 0.6°C
4 Cross Island (Dinkum Sands) Alaska 0.6°C
5 Prudhoe Bay #2 Alaska 0.7°C
6 Barrow Alaska 1.9°C
7 Point Barrow, Alaska Alaska 2.3°C
8 Point Barrow Alaska 2.3°C
9 Barrow (offshore) Alaska 2.3°C
10 Kotzebue, Kotzebue Sound Alaska 3.8°C
11 Goodhope Bay, Kotzebue Sound Alaska 3.9°C
12 Kiwalik, Kotzebue Sound, Alaska Alaska 3.9°C
13 Savoonga, St. Lawrence Island Alaska 3.9°C
14 Red Dog Dock Alaska 4.0°C
15 Kivalina Alaska 4.1°C
16 Cape Krusenstern, Kotzebue Sound Alaska 4.1°C
17 Powooiliak Point, St. Lawrence Island, Alaska Alaska 4.1°C
18 Fossil River entrance, St. Lawrence Island, Alaska Alaska 4.1°C
19 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 4.1°C
20 Deering, Kotzebue Sound Alaska 4.2°C
21 Akeftapak, St. Lawrence Island Alaska 4.2°C
22 Shishmaref Inlet 2 Alaska 4.2°C
23 Cape Espenberg, Kotzebue Sound Alaska 4.2°C
24 Kotzebue Alaska 4.2°C
25 Point Hope Alaska 4.2°C
Show 25 more ▸
26 Teller, Port Clarance, Norton Sound, Alaska Alaska 4.3°C
27 Teller, Port Clarence Alaska 4.3°C
28 Apoon Mouth, Yukon River, Norton Sound, Alaska Alaska 4.3°C
29 Nunam Iqua (Sheldon Point) Alaska 4.4°C
30 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska 4.4°C
31 Northeast Cape, St. Lawrence Island Alaska 4.4°C
32 Shaktoolik Alaska 4.5°C
33 Fort Peck Lake Montana 4.5°C
34 Tin City, Bering Sea Alaska 4.6°C
35 Outside Lopp Lagoon Alaska 4.6°C
36 Lost River, Seward Peninsula Alaska 4.7°C
37 Point Spencer, Port Clarence, Norton Sound Alaska 4.7°C
38 Black, Black River, Bering Sea, Alaska Alaska 5.0°C
39 Kokechik Bay, Bering Sea, Alaska Alaska 5.0°C
40 Pikmiktalik River entrance, Norton Sound, Alaska Alaska 5.1°C
41 Unalakleet Alaska 5.1°C
42 Nome, Norton Sound Alaska 5.2°C
43 Lake Sakakawea North Dakota 5.2°C
44 Helmick Point (SE of), Kuskokwim River Alaska 5.3°C
45 Popokamute, Alaska Alaska 5.3°C
46 North Bay, Stuart Island, Norton Sound, Alaska Alaska 5.4°C
47 St. Matthew Island, Bering Sea, Alaska Alaska 5.4°C
48 St. Michael, Norton Sound Alaska 5.4°C
49 Cape Romanzof, Bering Sea, Alaska Alaska 5.4°C
50 Carolyn Island, Golovnin Bay, Alaska Alaska 5.4°C

Warmest 10 in United States in October

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

# Location October mean
1 Long Island New York 29.3°C
2 Wake Island, Pacific Ocean Minor Outlying Islands 29.1°C
3 Palmyra Island Northern Line Islands 28.9°C
4 Boynton Beach, Lake Worth Florida 28.9°C
5 Lake Worth ICW Florida 28.9°C
6 Lake Worth (ICWW) Florida 28.9°C
7 Lake Worth Pier, Florida 28.9°C
8 Palm Beach, Highway 704 bridge, Lake Worth, Florida Florida 28.9°C
9 Palm Beach, Lake Worth, Florida Florida 28.9°C
10 Sand Key Lighthouse, Sand Key Channel Florida 28.9°C

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