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Warmest sea in United States in March

4,477 coastal locations in United States ranked by their typical March sea temperature. Region-wide average in March: 11.3°C. The top of the list is where to find the warmest swimming this month.

Warmest in March

Palmyra Island

28.0°C March mean in United States

Regional March average

11.3°C

across all 4,477 coastal locations in United States

Vs annual mean

-4.9°C

below the year-round regional average

What the United States sea feels like in March

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 March fits in the year

March 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 March 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 March

Sorted by the typical March 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 March mean
1 Palmyra Island Northern Line Islands 28.0°C
2 Howland Island Minor Outlying Islands 27.6°C
3 Jarvis Island Minor Outlying Islands 26.9°C
4 Wake Island, Pacific Ocean Minor Outlying Islands 26.5°C
5 Johnston Atoll, Pacific Ocean Minor Outlying Islands 26.1°C
6 Johnston Atoll Minor Outlying Islands 26.1°C
7 Long Island New York 25.8°C
8 Boynton Beach Florida 25.7°C
9 Briny Breezes Florida 25.7°C
10 Hypoluxo Florida 25.7°C
11 Lake Worth Florida 25.7°C
12 Lantana Florida 25.7°C
13 Manalapan Florida 25.7°C
14 Mar-a-Lago Florida 25.7°C
15 Ocean Ridge Florida 25.7°C
16 South Palm Beach Florida 25.7°C
17 West Palm Beach Florida 25.7°C
18 Boynton Beach, Lake Worth Florida 25.7°C
19 Lake Worth ICW Florida 25.7°C
20 Lake Worth (ICWW) Florida 25.7°C
21 Lake Worth Pier, Florida 25.7°C
22 Palm Beach, Highway 704 bridge, Lake Worth, Florida Florida 25.7°C
23 Palm Beach, Lake Worth, Florida Florida 25.7°C
24 West Palm Beach Canal, Lake Worth, Florida Florida 25.7°C
25 Carysfort Reef, Florida Florida 25.6°C
Show 25 more ▸
26 Key Largo Florida 25.6°C
27 Molasses Reef Florida 25.6°C
28 Pennekamp Florida 25.6°C
29 Rodriguez Key Florida 25.6°C
30 Adams Key, south end, Biscayne Bay, Florida Florida 25.4°C
31 Billys Point, south of, Elliott Key, Biscayne Bay, Florida Florida 25.4°C
32 Christmas Point, Elliott Key, Florida Florida 25.4°C
33 Coon Point, Elliott Key, Biscayne Bay, Florida Florida 25.4°C
34 Elliott Key Harbor, Elliott Key, Biscayne Bay Florida 25.4°C
35 Sea Grape Point, Elliott Key, Florida Florida 25.4°C
36 Coral Gables Florida 25.4°C
37 Cutler Bay Florida 25.4°C
38 Cutler Florida 25.4°C
39 Elliott Key Florida 25.4°C
40 Palmetto Bay Florida 25.4°C
41 Pinecrest Florida 25.4°C
42 Boca Chita Key Florida 25.3°C
43 Card Sound, western side, Florida Florida 25.3°C
44 Coral Shoal, Biscayne Channel, Florida Florida 25.3°C
45 Cormorant Point, Key Largo, Card Sound, Florida Florida 25.3°C
46 Cutler, Biscayne Bay Florida 25.3°C
47 Dinner Key Marina, Biscayne Bay, Florida Florida 25.3°C
48 Garden Cove, Key Largo, Florida Florida 25.3°C
49 Key Largo, South Sound, Key Largo, Florida Florida 25.3°C
50 Largo Sound, Key Largo, Florida Florida 25.3°C

Coldest 10 in United States in March

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

# Location March mean
1 Point Hope Alaska -1.7°C
2 Savoonga, St. Lawrence Island Alaska -1.7°C
3 Northeast Cape, St. Lawrence Island Alaska -1.7°C
4 Kivalina Alaska -1.7°C
5 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska -1.7°C
6 Fossil River entrance, St. Lawrence Island, Alaska Alaska -1.6°C
7 Moghoweyik River entrance, St. Lawrence Island, Alaska Alaska -1.6°C
8 Outside Lopp Lagoon Alaska -1.6°C
9 Cape Espenberg, Kotzebue Sound Alaska -1.6°C
10 Cape Krusenstern, Kotzebue Sound Alaska -1.6°C

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