Skip to content
seatemperatures.net

Warmest beach in Florida in September

819 coastal locations in Florida ranked by their typical September sea temperature. State-wide average in September: 29.4°C.

Warmest in September

Sawyer Key, inside, Cudjoe Channel, Florida

30.3°C

State September average

29.4°C

across 819 coastal locations in Florida

Vs annual mean

+4.1°C

above the year-round state average

What the Florida water feels like in September

This water temperature is comparable to that of a swimming pool, but it might be higher than most open water swimmers prefer for serious swimming. Make sure to drink plenty of water before and after swimming and don't wear a wetsuit to avoid overheating.

Florida monthly average 20.1°C to 30.1°C
J
F
M
A
M
J
J
A
S
O
N
D
  • Warmest month August 30.1°C
  • Coldest month January 20.1°C
  • Annual mean 25.4°C
  • Months above 20°C 12 of 12

Where September fits in the year

September sits inside the state pattern shown on the left. Browse a different month for a fresh ranking.

Florida sea temperature map (live)

Today's reading at every Florida beach we track. The list below uses the typical September mean from a decade of daily history.

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 Florida beaches in September

Sorted by typical September mean. Click any beach for the full location page.

# Location September mean
1 Sawyer Key, inside, Cudjoe Channel, Florida Florida 30.3°C
2 Sawyer Key, outside, Cudjoe Channel, Florida Florida 30.3°C
3 Sawyer Key Florida 30.3°C
4 Fleming Key, north end Florida 30.3°C
5 Key West, south side, White Street Pier, Florida Florida 30.3°C
6 Sigsbee Park, Garrison Bight Channel, Florida Florida 30.3°C
7 Smith Shoal Light Florida 30.3°C
8 Annette Key, north end, Big Spanish Channel, Florida Florida 30.2°C
9 Big Spanish Key, Florida Florida 30.2°C
10 Content Keys, Content Passage, Florida Florida 30.2°C
11 Crawl Key, Big Spanish Channel, Florida Florida 30.2°C
12 Horseshoe Keys, south end, Florida Florida 30.2°C
13 Howe Key, northwest end, Florida Florida 30.2°C
14 Johnson Keys, north end, Florida Florida 30.2°C
15 Little Pine Key, north end, Florida Florida 30.2°C
16 Little Spanish Key, Spanish Banks, Florida Florida 30.2°C
17 West Bahia Honda Key, Florida Florida 30.2°C
18 Big Coppitt Key, northeast side, Waltz Key Basin, Florida Florida 30.2°C
19 Bird Key, Similar Sound, Florida Florida 30.2°C
20 Boca Chica Channel Bridge, Florida Florida 30.2°C
21 Boca Chica Key, Long Point, Florida Florida 30.2°C
22 Boca Chica Key, Southwest end, Florida Florida 30.2°C
23 Boca Chica Marina Florida 30.2°C
24 Cudjoe Key, Pirates Cove, Florida Florida 30.2°C
25 Duck Key Point, Duck Key, Waltz Key Basin, Florida Florida 30.2°C
Show 25 more ▸
26 O'Hara Key, north end, Waltz Key Basin, Florida Florida 30.2°C
27 Rockland Key, Rockland Channel Bridge, Florida Florida 30.2°C
28 Saddlebunch Keys, Channel No. 3, Florida Florida 30.2°C
29 Saddlebunch Keys, Channel No. 4, Florida Florida 30.2°C
30 Saddlebunch Keys, Channel No. 5, Florida Florida 30.2°C
31 Saddlebunch Keys, Similar Sound, Florida Florida 30.2°C
32 Shark Key, southeast end, Similar Sound, Florida Florida 30.2°C
33 Snipe Keys, Middle Narrows, Florida Florida 30.2°C
34 Snipe Keys, Snipe Point, Florida Florida 30.2°C
35 Sugarloaf Key, east side, Tarpon Creek, Florida Florida 30.2°C
36 Sugarloaf Key, Pirates Cove, Florida Florida 30.2°C
37 Tarpon Creek, Upper Sugarloaf Sound, Florida Florida 30.2°C
38 Waltz Key, Waltz Key Basin, Florida Florida 30.2°C
39 Fort Zachary Taylor Florida 30.2°C
40 Key West Florida 30.2°C
41 Big Coppitt Key Florida 30.2°C
42 Stock Island Florida 30.2°C
43 Sugarloaf Key Florida 30.2°C
44 Cape Sable, East Cape, Florida Florida 30.2°C
45 East Bahia Honda Key, south end, Florida Bay, Florida Florida 30.2°C
46 Bahia Honda Florida 30.2°C
47 Big Pine Key Florida 30.2°C
48 Cape Romano, Florida Florida 30.2°C
49 Coon Key Pass, Gullivan Bay Florida 30.2°C
50 Cudjoe Key Florida 30.2°C

Coldest 10 in Florida in September

Same data the other way.

# Location September mean
1 Kings Ferry, St. Marys River, Florida Florida 27.9°C
2 Amelia City, South Amelia River, Florida Florida 28.0°C
3 Boggy Creek, 2 mi. above entrance, Nassau River, Florida Florida 28.0°C
4 Chester, Bells River Florida 28.0°C
5 Crandall, St. Marys River Florida 28.0°C
6 Cuno, Lofton Creek, Nassau River, Florida Florida 28.0°C
7 Cut 1N front range, St. Marys River Florida 28.0°C
8 Cut 2N front range, St. Marys River Florida 28.0°C
9 Edwards Creek, Nassau River Florida 28.0°C
10 Halfmoon Island, highway bridge, Nassau River, Florida Florida 28.0°C

Other US states

Related rankings