Skip to content
seatemperatures.net

Warmest sea in United States

4,477 coastal locations in United States ranked by their year-round average sea temperature. The regional average is 16.2°C. The top of the list shows where to find the warmest water in a typical year. The bottom shows the coldest year-round coasts of the region.

Warmest location

Palmyra Island

28.5°C annual mean in United States

Regional average

16.2°C

across all 4,477 United States coastal locations

Warmest month

August

22.6°C region-wide average

United States monthly average 10.0°C to 22.6°C
J
F
M
A
M
J
J
A
S
O
N
D
  • Warmest month August 22.6°C
  • Coldest month February 10.0°C
  • Annual mean 16.2°C
  • Months above 20°C 3 of 12

Month by month across United States

Sea temperatures in United States swing from 10.0°C in February to 22.6°C in August on average across every coast we track. That spread of 13°C hides much bigger swings at individual locations.

Want a specific month? Pick one for a dedicated ranking:

United States sea temperature map

Today's pin colours show the latest daily reading at every United States location we track. Pick any pin for the location's full page.

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 locations in United States

The warmest coastal locations across all of United States, sorted by year-round average. Click any place for its 30-day chart, monthly profile, and 10-year history.

# Location Annual mean
1 Palmyra Island Northern Line Islands 28.5°C
2 Howland Island Minor Outlying Islands 28.4°C
3 Wake Island, Pacific Ocean Minor Outlying Islands 27.9°C
4 Long Island New York 27.7°C
5 Boynton Beach, Lake Worth Florida 27.7°C
6 Lake Worth ICW Florida 27.7°C
7 Lake Worth (ICWW) Florida 27.7°C
8 Lake Worth Pier, Florida 27.7°C
9 Palm Beach, Highway 704 bridge, Lake Worth, Florida Florida 27.7°C
10 Palm Beach, Lake Worth, Florida Florida 27.7°C
11 West Palm Beach Canal, Lake Worth, Florida Florida 27.7°C
12 Boynton Beach Florida 27.7°C
13 Briny Breezes Florida 27.7°C
14 Hypoluxo Florida 27.7°C
15 Lake Worth Florida 27.7°C
16 Lantana Florida 27.7°C
17 Manalapan Florida 27.7°C
18 Mar-a-Lago Florida 27.7°C
19 Ocean Ridge Florida 27.7°C
20 South Palm Beach Florida 27.7°C
21 West Palm Beach Florida 27.7°C
22 Carysfort Reef, Florida Florida 27.6°C
23 Key Largo Florida 27.6°C
24 Molasses Reef Florida 27.6°C
25 Pennekamp Florida 27.6°C
Show 25 more ▸
26 Rodriguez Key Florida 27.6°C
27 Adams Key, south end, Biscayne Bay, Florida Florida 27.5°C
28 Billys Point, south of, Elliott Key, Biscayne Bay, Florida Florida 27.5°C
29 Christmas Point, Elliott Key, Florida Florida 27.5°C
30 Coon Point, Elliott Key, Biscayne Bay, Florida Florida 27.5°C
31 Elliott Key Harbor, Elliott Key, Biscayne Bay Florida 27.5°C
32 Sea Grape Point, Elliott Key, Florida Florida 27.5°C
33 Coral Gables Florida 27.5°C
34 Cutler Bay Florida 27.5°C
35 Cutler Florida 27.5°C
36 Elliott Key Florida 27.5°C
37 Palmetto Bay Florida 27.5°C
38 Pinecrest Florida 27.5°C
39 Boca Chita Key Florida 27.5°C
40 Coral Shoal, Biscayne Channel, Florida Florida 27.5°C
41 Cutler, Biscayne Bay Florida 27.5°C
42 Dinner Key Marina, Biscayne Bay, Florida Florida 27.5°C
43 Ragged Key No. 5, Biscayne Bay Florida 27.5°C
44 Ragged Keys, Biscayne Bay, Florida Florida 27.5°C
45 Sands Key, northwest point, Biscayne Bay, Florida Florida 27.5°C
46 Soldier Key, Florida Florida 27.5°C
47 Virginia Key, Bear Cut, Biscayne Bay Florida 27.5°C
48 Bahia Mar Yacht Club, Fort Lauderdale, Florida Florida 27.4°C
49 Bakers Haulover Inlet (inside), Florida Florida 27.4°C
50 Bay Harbor Islands Florida 27.4°C

Coldest 10 in United States for contrast

Same data, sorted the other way. Useful if you want to know which United States coasts stay coldest year-round.

# Location Annual mean
1 Prudhoe Bay #2 Alaska -0.3°C
2 Prudhoe Bay Alaska -0.3°C
3 Flaxman Island Alaska -0.3°C
4 Cross Island (Dinkum Sands) Alaska -0.3°C
5 Barrow Alaska -0.2°C
6 Barter Island Alaska -0.1°C
7 Barrow (offshore) Alaska 0.1°C
8 Point Barrow, Alaska Alaska 0.1°C
9 Point Barrow Alaska 0.1°C
10 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 1.5°C

More on this region