canIswim

Sea temperature and swimming season in United States

When the sea is warm enough to swim in 73 coastal cities in United States.

CityWarmestColdestSwimming season
New York City 23.5°C Aug 3.9°C Feb Jun – Sep (4 months)
San Diego 21.1°C Aug 15.1°C Feb Jul – Oct (4 months)
San Francisco 15.5°C Sep 11.8°C Mar never comfortable
Boston 19.3°C Aug 3.8°C Feb Aug – Aug (1 months)
Miami 30.3°C Aug 24.4°C Feb all year
Long Beach 21.0°C Aug 15.1°C Feb Jul – Oct (4 months)
Virginia Beach 25.9°C Jul 5.5°C Feb Jun – Oct (5 months)
New Orleans 30.7°C Aug 12.4°C Jan Apr – Nov (8 months)
Honolulu 27.1°C Oct 24.7°C Mar all year
Anchorage 14.7°C Aug -1.1°C Feb never comfortable
Oxnard 20.2°C Sep 14.3°C Mar Jul – Oct (4 months)
Oceanside 21.9°C Aug 15.2°C Feb Jun – Oct (5 months)
Cape Coral 30.9°C Aug 19.3°C Jan all year
Hollywood 30.3°C Aug 24.5°C Feb all year
Bridgeport 24.2°C Aug 2.2°C Feb Jul – Oct (4 months)
Hampton 27.0°C Jul 4.8°C Feb Jun – Oct (5 months)
Charleston 29.0°C Aug 12.2°C Feb Apr – Nov (8 months)
New Haven 23.9°C Aug 2.3°C Feb Jul – Sep (3 months)
West Palm Beach 30.3°C Aug 25.2°C Feb all year
Wilmington 28.2°C Aug 10.3°C Feb May – Oct (6 months)
Inglewood 20.6°C Aug 14.8°C Feb Jul – Oct (4 months)
Pompano Beach 30.3°C Aug 24.6°C Feb all year
New Bedford 22.4°C Aug 2.3°C Feb Jul – Sep (3 months)
Fall River 22.4°C Aug 2.3°C Feb Jul – Sep (3 months)
Santa Barbara 19.3°C Sep 13.9°C Mar Sep – Sep (1 months)
Norwalk 24.1°C Aug 2.3°C Feb Jul – Oct (4 months)
Melbourne 28.9°C Sep 20.5°C Feb all year
Largo 30.9°C Aug 16.9°C Jan Mar – Dec (10 months)
Daytona Beach 28.8°C Aug 17.5°C Feb Mar – Dec (10 months)
Portland 18.7°C Aug 4.1°C Feb never comfortable
Palo Alto 15.7°C Sep 12.1°C Mar never comfortable
Santa Cruz 15.6°C Sep 12.3°C May never comfortable
Fountain Valley 21.0°C Aug 15.0°C Feb Jul – Oct (4 months)
Bradenton 31.0°C Aug 17.8°C Jan Mar – Dec (10 months)
Pensacola 30.4°C Aug 16.9°C Feb Mar – Dec (10 months)
Barnstable 22.2°C Aug 2.3°C Feb Jul – Sep (3 months)
Hilo 26.7°C Oct 24.4°C Mar all year
Salem 19.2°C Aug 3.7°C Feb Aug – Aug (1 months)
Annapolis 27.8°C Jul 3.2°C Feb Jun – Oct (5 months)
Hilton Head Island 29.4°C Aug 12.3°C Feb Apr – Nov (8 months)
Atlantic City 24.0°C Jul 4.1°C Feb Jun – Sep (4 months)
Kailua 27.0°C Oct 24.6°C Mar all year
Panama City 30.3°C Aug 16.1°C Jan Mar – Nov (9 months)
Waipahu 27.2°C Sep 24.8°C Feb all year
Dana Point 21.6°C Sep 15.2°C Feb Jun – Oct (5 months)
Foster City 15.7°C Sep 12.1°C Mar never comfortable
Oceanside 23.5°C Jul 3.9°C Feb Jul – Sep (3 months)
Laplace 30.8°C Aug 12.4°C Jan Apr – Nov (8 months)
Monterey 15.4°C Sep 12.2°C Apr never comfortable
Bay Shore 23.4°C Jul 4.1°C Feb Jul – Sep (3 months)
Key West 30.7°C Aug 22.7°C Jan all year
Tarpon Springs 30.9°C Aug 16.3°C Jan Mar – Nov (9 months)
Newport 21.1°C Aug 4.2°C Feb Jul – Sep (3 months)
Fort Walton Beach 30.3°C Aug 17.2°C Feb Mar – Dec (10 months)
Portsmouth 18.9°C Aug 4.3°C Feb never comfortable
Naples 30.9°C Aug 19.6°C Jan all year
Arcata 13.4°C Sep 10.4°C Mar never comfortable
Mill Valley 15.5°C Sep 11.9°C Mar never comfortable
Carpinteria 19.3°C Sep 13.9°C Mar Sep – Sep (1 months)
Jericho 23.5°C Jul 3.9°C Feb Jul – Sep (3 months)
Atlantic Beach 28.9°C Aug 14.2°C Feb Apr – Nov (8 months)
Ferndale 15.7°C Aug 7.6°C Feb never comfortable
Saint Augustine 28.9°C Aug 16.3°C Feb Apr – Nov (8 months)
Half Moon Bay 15.7°C Sep 12.1°C Mar never comfortable
Sitka 13.8°C Aug 5.5°C Mar never comfortable
Pismo Beach 15.6°C Sep 12.0°C Apr never comfortable
Kenai 13.6°C Aug 0.5°C Feb never comfortable
Fort Bragg 14.1°C Sep 10.7°C May never comfortable
Ocean City 24.2°C Jul 4.6°C Feb Jun – Oct (5 months)
Kodiak 11.7°C Aug 4.1°C Mar never comfortable
Nome 11.1°C Aug -1.6°C Mar never comfortable
Lewes 24.5°C Jul 3.0°C Feb Jun – Sep (4 months)
Dillingham 14.9°C Aug -1.5°C Jan never comfortable

Season uses 19°C. Why that number, and where the data comes from