Swimming in the United States (USA) in september 2024 Sea temperature by city in september

Do you want to go to the beach in the United States (USA) in september 2024? Is it the right month to go for pleasant temperatures and staying in the water for a long time? The answer is on this page with the sea temperatures in september in the United States (USA) by city and our opinion on the chances of enjoying pleasant sea conditions.

Sea temperature in the United States (USA) in september 2024

Here, find the average sea temperature in the United States (USA) in september in several coastal cities.

California

on average:

67°F

min: 64°F / max: 70°F

details

Washington D. C.

Boston

on average:

65°F

min: 62°F / max: 68°F

details

Hawaii (Honolulu)

Miami (Florida)

New York City

on average:

70°F

min: 67°F / max: 74°F

details

Seattle

on average:

54°F

min: 52°F / max: 56°F

details

Houston

on average:

84°F

min: 80°F / max: 88°F

details

Long Beach (Washington)

Myrtle Beach

on average:

81°F

min: 78°F / max: 83°F

details

Philadelphia

on average:

72°F

min: 68°F / max: 76°F

details

Portland

on average:

56°F

min: 54°F / max: 59°F

details

Atlantic City

on average:

72°F

min: 67°F / max: 76°F

details

Baltimore

on average:

74°F

min: 71°F / max: 77°F

details

Bar Harbor (Maine)

Brooklyn

on average:

71°F

min: 67°F / max: 74°F

details

Cape Cod National Seashore

Carolina Beach

Dauphin Island (Alabama)

Edisto Beach

on average:

82°F

min: 80°F / max: 85°F

details

Where should you go swimming in the United States (USA) in the month of september?

Swimming in the United States (USA) in september is ideal (in the best case scenario)

In september in the United States (USA) swimming conditions vary by city. Details below:

In september in Hawaii (Honolulu), Miami (Florida), Houston, Myrtle Beach, Carolina Beach, Dauphin Island (Alabama) and Edisto Beach, swimming conditions are perfect! With water reaching a maximum of 83°F and an average of 81°F, going in the water (and staying there!) feels great.

As for Washington D. C., New York City, Philadelphia, Atlantic City, Baltimore and Brooklyn, swimming is pleasant in september. The sea water is 75°F on average (min: 72°F/max: 77°F) so you can easily spend time in the water.

Swimming in september in California, Boston and Cape Cod National Seashore is possible but the sea is generally cool. So though the sea temperature may sometimes reach 70°F, it can also go as low as 64°F. Note that the average is 67°F.

Forget about swimming in Seattle, Long Beach (Washington), Portland and Bar Harbor (Maine) in september! The water temperature is freezing, reaching as low as 52°F (and only 56°F at the best of times). Our advice: plan on sightseeing, and don't bring your beach towel!

Where to go swimming in the United States (USA) in september: the map of sea temperatures

ideal swimming pleasant swimming cool swimming cold swimming freezing swimming

Water temperature and seasonal norms in september

California

September
Average sea temperature 67°F
Minimum sea temperature 64°F
Maximum sea temperature 70°F
Average outside temperature 85°F
Maximum outside temperature 99°F
Minimum outside temperature 72°F
Precipitation 0.3in
Number of days of precipitation 0 jour(s)
(1%)
Cloud cover 5%
Our opinion cool swimming

More information on swimming in California in september

Washington D. C.

September
Average sea temperature 75°F
Minimum sea temperature 72°F
Maximum sea temperature 77°F
Average outside temperature 74°F
Maximum outside temperature 83°F
Minimum outside temperature 67°F
Precipitation 4.7in
Number of days of precipitation 6 jour(s)
(19%)
Cloud cover 35%
Our opinion pleasant swimming

More information on swimming in Washington D. C. in september

Boston

September
Average sea temperature 65°F
Minimum sea temperature 62°F
Maximum sea temperature 68°F
Average outside temperature 70°F
Maximum outside temperature 76°F
Minimum outside temperature 63°F
Precipitation 3.1in
Number of days of precipitation 4 jour(s)
(13%)
Cloud cover 36%
Our opinion cool swimming

More information on swimming in Boston in september

Hawaii (Honolulu)

September
Average sea temperature 81°F
Minimum sea temperature 79°F
Maximum sea temperature 83°F
Average outside temperature 81°F
Maximum outside temperature 83°F
Minimum outside temperature 79°F
Precipitation 2.6in
Number of days of precipitation 3 jour(s)
(11%)
Cloud cover 33%
Our opinion ideal swimming

More information on swimming in Hawaii (Honolulu) in september

Miami (Florida)

September
Average sea temperature 86°F
Minimum sea temperature 84°F
Maximum sea temperature 87°F
Average outside temperature 86°F
Maximum outside temperature 88°F
Minimum outside temperature 85°F
Precipitation 9.8in
Number of days of precipitation 19 jour(s)
(62%)
Cloud cover 30%
Our opinion ideal swimming

More information on swimming in Miami (Florida) in september

List of coastal cities in the United States (USA)

California in septembercool swimming
Washington D. C. in septemberpleasant swimming
Boston in septembercool swimming
Hawaii (Honolulu) in septemberideal swimming
Miami (Florida) in septemberideal swimming
New York City in septemberpleasant swimming
Seattle in septemberfreezing swimming
Houston in septemberideal swimming
Long Beach (Washington) in septemberfreezing swimming
Myrtle Beach in septemberideal swimming
Philadelphia in septemberpleasant swimming
Portland in septemberfreezing swimming
Atlantic City in septemberpleasant swimming
Baltimore in septemberpleasant swimming
Bar Harbor (Maine) in septemberfreezing swimming
Brooklyn in septemberpleasant swimming
Cape Cod National Seashore in septembercool swimming
Carolina Beach in septemberideal swimming
Dauphin Island (Alabama) in septemberideal swimming
Edisto Beach in septemberideal swimming
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