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Warmest sea in United States in October

4,477 coastal locations in United States ranked by their typical October sea temperature. Region-wide average in October: 18.8°C. The top of the list is where to find the warmest swimming this month.

Warmest in October

Long Island

29.3°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, useful for trip planning weeks or months ahead.

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 warmest United States locations in October

Sorted by the typical October mean built from a decade of daily readings at each location. Click any place for its 30-day chart, monthly profile, and full 10-year history.

# 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
11 West Palm Beach Canal, Lake Worth, Florida Florida 28.9°C
12 Carysfort Reef, Florida Florida 28.9°C
13 Boynton Beach Florida 28.8°C
14 Briny Breezes Florida 28.8°C
15 Hypoluxo Florida 28.8°C
16 Lake Worth Florida 28.8°C
17 Lantana Florida 28.8°C
18 Manalapan Florida 28.8°C
19 Mar-a-Lago Florida 28.8°C
20 Ocean Ridge Florida 28.8°C
21 South Palm Beach Florida 28.8°C
22 West Palm Beach Florida 28.8°C
23 Adams Key, south end, Biscayne Bay, Florida Florida 28.8°C
24 Billys Point, south of, Elliott Key, Biscayne Bay, Florida Florida 28.8°C
25 Christmas Point, Elliott Key, Florida Florida 28.8°C
Show 25 more ▸
26 Coon Point, Elliott Key, Biscayne Bay, Florida Florida 28.8°C
27 Elliott Key Harbor, Elliott Key, Biscayne Bay Florida 28.8°C
28 Garden Key, Dry Tortugas, Florida Florida 28.8°C
29 Sea Grape Point, Elliott Key, Florida Florida 28.8°C
30 Key Largo Florida 28.8°C
31 Molasses Reef Florida 28.8°C
32 Pennekamp Florida 28.8°C
33 Rodriguez Key Florida 28.8°C
34 Boca Chita Key Florida 28.8°C
35 Coral Shoal, Biscayne Channel, Florida Florida 28.8°C
36 Cutler, Biscayne Bay Florida 28.8°C
37 Dinner Key Marina, Biscayne Bay, Florida Florida 28.8°C
38 Ragged Key No. 5, Biscayne Bay Florida 28.8°C
39 Ragged Keys, Biscayne Bay, Florida Florida 28.8°C
40 Sands Key, northwest point, Biscayne Bay, Florida Florida 28.8°C
41 Soldier Key, Florida Florida 28.8°C
42 Virginia Key, Bear Cut, Biscayne Bay Florida 28.8°C
43 Bakers Haulover Inlet (inside), Florida Florida 28.7°C
44 Bay Harbor Islands Florida 28.7°C
45 Biscayne Creek, ICWW, Florida Florida 28.7°C
46 Dodge Island, Fishermans Channel, Biscayne Bay, Florida Florida 28.7°C
47 Dumfoundling Bay, Florida Florida 28.7°C
48 Government Cut, Miami Harbor Entrance Florida 28.7°C
49 Haulover Beach Florida 28.7°C
50 Haulover Pier, N. Miami Beach Florida 28.7°C

Coldest 10 in United States in October

Same data the other way. Helpful if you want to know which United States coasts to avoid for swimming in October.

# 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

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