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Warmest sea in United States in January

4,477 coastal locations in United States ranked by their typical January sea temperature. Region-wide average in January: 10.6°C. The top of the list is where to find the warmest swimming this month.

Warmest in January

Palmyra Island

28.0°C January mean in United States

Regional January average

10.6°C

across all 4,477 coastal locations in United States

Vs annual mean

-5.6°C

below the year-round regional average

What the United States sea feels like in January

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 January fits in the year

January 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 January 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 January

Sorted by the typical January 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 January mean
1 Palmyra Island Northern Line Islands 28.0°C
2 Howland Island Minor Outlying Islands 28.0°C
3 Wake Island, Pacific Ocean Minor Outlying Islands 27.0°C
4 Johnston Atoll, Pacific Ocean Minor Outlying Islands 26.5°C
5 Johnston Atoll Minor Outlying Islands 26.5°C
6 Jarvis Island Minor Outlying Islands 26.4°C
7 Long Island New York 26.3°C
8 Napoopoo, Kealakekua Bay, Hawaii Island, Hawaii Hawaii 25.6°C
9 Boynton Beach Florida 25.6°C
10 Briny Breezes Florida 25.6°C
11 Hypoluxo Florida 25.6°C
12 Lake Worth Florida 25.6°C
13 Lantana Florida 25.6°C
14 Manalapan Florida 25.6°C
15 Mar-a-Lago Florida 25.6°C
16 Ocean Ridge Florida 25.6°C
17 South Palm Beach Florida 25.6°C
18 West Palm Beach Florida 25.6°C
19 Boynton Beach, Lake Worth Florida 25.6°C
20 Lake Worth ICW Florida 25.6°C
21 Lake Worth (ICWW) Florida 25.6°C
22 Lake Worth Pier, Florida 25.6°C
23 Palm Beach, Highway 704 bridge, Lake Worth, Florida Florida 25.6°C
24 Palm Beach, Lake Worth, Florida Florida 25.6°C
25 West Palm Beach Canal, Lake Worth, Florida Florida 25.6°C
Show 25 more ▸
26 Mahukona, Hawaii Island, Hawaii Hawaii 25.5°C
27 Kuheia Bay, Kahoolawe Island, Hawaii Hawaii 25.5°C
28 Smuggler Cove, Kahoolawe Island, Hawaii Hawaii 25.5°C
29 Island of Hawaii Hawaii 25.4°C
30 Kahaluu-Keauhou Hawaii 25.4°C
31 Kailua Kona Hawaii 25.4°C
32 Kealakekua Bay Hawaii 25.4°C
33 Kaumalapau, Lanai Island, Hawaii Hawaii 25.4°C
34 Makena, Maui Island, Hawaii Hawaii 25.4°C
35 Kua Bay Hawaii 25.4°C
36 Hapuna Beach Hawaii 25.3°C
37 Puako Hawaii 25.3°C
38 Waikoloa Village Hawaii 25.3°C
39 Kaunakakai Harbor, Molokai Island Hawaii 25.3°C
40 Kolo, Molokai Island, Hawaii Hawaii 25.3°C
41 Honuapo, Hawaii Island, Hawaii Hawaii 25.3°C
42 Kahului, Kahului Harbor Hawaii 25.2°C
43 Kihei, Maalaea Bay, Maui Island, Hawaii Hawaii 25.2°C
44 Waianae, Oahu Island, Hawaii Hawaii 25.2°C
45 Kamalo Harbor, Molokai Island, Hawaii Hawaii 25.2°C
46 Pukoo Harbor, Molokai Island, Hawaii Hawaii 25.2°C
47 Kawaihae Hawaii 25.2°C
48 Fort Kamehameha, Bishop Point, Pearl Harbor, Oahu Island Hawaii 25.2°C
49 Honolulu, Honolulu Harbor, Oahu Island Hawaii 25.2°C
50 Moku o Loe, Kaneohe Bay, Oahu Island Hawaii 25.2°C

Coldest 10 in United States in January

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

# Location January mean
1 Barrow Alaska -1.7°C
2 Cape Espenberg, Kotzebue Sound 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 Point Hope Alaska -1.6°C
7 Savoonga, St. Lawrence Island Alaska -1.6°C
8 Fossil River entrance, St. Lawrence Island, Alaska Alaska -1.6°C
9 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska -1.6°C
10 Red Dog Dock Alaska -1.6°C

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