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Warmest sea in United States in August

4,477 coastal locations in United States ranked by their typical August sea temperature. Region-wide average in August: 22.6°C. The top of the list is where to find the warmest swimming this month.

Warmest in August

Lake Pleasant

31.5°C August mean in United States

Regional August average

22.6°C

across all 4,477 coastal locations in United States

Vs annual mean

+6.4°C

above the year-round regional average

What the United States sea feels like in August

Water at this temperature is very pleasant to swim in. If you tend to wear a wetsuit when swimming, you might consider removing it now to avoid the body overheating.

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 August fits in the year

August 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 August 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 August

Sorted by the typical August 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 August mean
1 Lake Pleasant Arizona 31.5°C
2 Lake Powell Arizona 31.5°C
3 Phoenix Arizona 31.5°C
4 Denver Colorado 31.2°C
5 Lostmans River entrance, Florida Florida 31.1°C
6 Onion Key Bay Florida 31.1°C
7 Onion Key, Lostmans River, Florida Florida 31.1°C
8 Shark River entrance, Florida Florida 31.1°C
9 Cape Sable, East Cape, Florida Florida 31.0°C
10 Flamingo, Florida Bay, Florida Florida 31.0°C
11 Las Cruces New Mexico 30.9°C
12 Crane Keys, north side, Florida Bay, Florida Florida 30.9°C
13 East Bahia Honda Key, south end, Florida Bay, Florida Florida 30.9°C
14 Tavernier Creek, Hwy. 1 bridge, Hawk Channel, Florida Florida 30.9°C
15 Anna Maria Key, city pier, Florida Florida 30.9°C
16 Apollo Beach, Hillsborough Bay, Tampa Bay, Florida Florida 30.9°C
17 Ballast Point, Tampa Florida 30.9°C
18 Bay Aristocrat Village, Old Tampa Bay, Florida Florida 30.9°C
19 CSX Rockport, Mckay Bay Entrance Florida 30.9°C
20 Davis Island, Hillsborough Bay, Florida Florida 30.9°C
21 Davis Islands Florida 30.9°C
22 East Bay (Tampa) Florida 30.9°C
23 Gandy Bridge, Old Tampa Bay, Florida Florida 30.9°C
24 Gulfport, Boca Ciega Bay, Florida Florida 30.9°C
25 Isla Del Sol Florida 30.9°C
Show 25 more ▸
26 Little Manatee Heights Florida 30.9°C
27 Little Manatee River Florida 30.9°C
28 Mullet Key Channel (Skyway), Tampa Bay Florida 30.9°C
29 Newman Branch, Tampa Bay Florida 30.9°C
30 Pass-a-Grille Beach, Boca Ciega Bay, Florida Florida 30.9°C
31 Pendola Point, Hillsborough Bay, Florida Florida 30.9°C
32 Point Pinellas, Florida Florida 30.9°C
33 Port Manatee, Tampa Bay Florida 30.9°C
34 Port Tampa, Old Tampa Bay Florida 30.9°C
35 Redfish Point, Manatee River, Florida Florida 30.9°C
36 Safety Harbor, Old Tampa Bay Florida 30.9°C
37 Saint Petersburg Florida 30.9°C
38 Shell Point, Florida Florida 30.9°C
39 St. Petersburg, Tampa Bay Florida 30.9°C
40 Annette Key, north end, Big Spanish Channel, Florida Florida 30.9°C
41 Big Spanish Key, Florida Florida 30.9°C
42 Content Keys, Content Passage, Florida Florida 30.9°C
43 Crawl Key, Big Spanish Channel, Florida Florida 30.9°C
44 Horseshoe Keys, south end, Florida Florida 30.9°C
45 Howe Key, northwest end, Florida Florida 30.9°C
46 Johnson Keys, north end, Florida Florida 30.9°C
47 Little Pine Key, north end, Florida Florida 30.9°C
48 Little Spanish Key, Spanish Banks, Florida Florida 30.9°C
49 West Bahia Honda Key, Florida Florida 30.9°C
50 Anna Maria Key, Bradenton Beach, Florida Florida 30.9°C

Coldest 10 in United States in August

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

# Location August mean
1 Barrow Alaska 3.3°C
2 Prudhoe Bay Alaska 3.9°C
3 Flaxman Island Alaska 3.9°C
4 Cross Island (Dinkum Sands) Alaska 4.2°C
5 Prudhoe Bay #2 Alaska 4.2°C
6 Barter Island Alaska 4.3°C
7 Barrow (offshore) Alaska 4.8°C
8 Point Barrow, Alaska Alaska 4.9°C
9 Point Barrow Alaska 4.9°C
10 Maknik Lagoon entrance, St. Lawrence Island, Alaska Alaska 7.5°C

More on this region