05.09
sat
sat
Day
86°F
NW 9 mph
Precip.
12%
12%
Night
81°F
SW 12 mph
Precip.
20%
20%
06.09
sun
sun
Day
86°F
NW 2 mph
Precip.
36%
36%
Night
86°F
N 4 mph
Precip.
5%
5%
07.09
mon
mon
Day
86°F
N 4 mph
Precip.
7%
7%
Night
82°F
W 15 mph
Precip.
29%
29%
08.09
tue
tue
Day
86°F
W 8 mph
Precip.
14%
14%
Night
86°F
W 14 mph
Precip.
6%
6%
09.09
wed
wed
Day
86°F
W 12 mph
Precip.
12%
12%
Night
86°F
W 16 mph
Precip.
13%
13%
10.09
thu
thu
Day
86°F
W 10 mph
Precip.
18%
18%
Night
86°F
W 9 mph
Precip.
18%
18%
11.09
fri
fri
Day
86°F
W 2 mph
Precip.
50%
50%
Night
86°F
W 6 mph
Precip.
16%
16%
12.09
sat
sat
Day
86°F
W 5 mph
Precip.
14%
14%
Night
84°F
W 16 mph
Precip.
50%
50%
13.09
sun
sun
Day
84°F
W 18 mph
Precip.
25%
25%
Night
84°F
NW 14 mph
Precip.
27%
27%
14.09
mon
mon
Day
82°F
NW 23 mph
Precip.
61%
61%
Night
86°F
W 17 mph
Precip.
51%
51%
15.09
tue
tue
Day
84°F
W 22 mph
Precip.
49%
49%
Night
82°F
W 15 mph
Precip.
57%
57%
16.09
wed
wed
Day
84°F
W 16 mph
Precip.
57%
57%
Night
84°F
W 19 mph
Precip.
16%
16%
17.09
thu
thu
Day
81°F
W 14 mph
Precip.
76%
76%
Night
82°F
W 17 mph
Precip.
54%
54%
18.09
fri
fri
Day
79°F
W 8 mph
Precip.
70%
70%
Night
82°F
W 8 mph
Precip.
35%
35%
sea water
temperature
temperature
| Key Largo |
monthly
weather
weather
| Key Largo |
current
weather
weather
| Key Largo |
7 days
forecast
forecast
| Key Largo |
Sea water temperature in September, °F
Show year:
2025
2024
2023
The average sea water temperature in September of 2025 was 86.6°F. The highest and lowest sea temperatures during the month were 88.5°F and 85.5°F.
Air temperature in Key Largo, °F
Precipitation total in Key Largo, in.
* Charts above show average data for the last 3 years.
Best time for vacation in Key Largo
Key Largo on a weather map
Places in USA:
Name
°F
24 Hours Forecast
Key Largo
Local time: 03:37
September 05, saturday
0600
82°F
NW
11 mph
11 mph
0900
86°F
NW
9 mph
9 mph
1200
86°F
NW
9 mph
9 mph
1500
86°F
NW
5 mph
5 mph
1800
86°F
NW
6 mph
6 mph
2100
84°F
W
10 mph
10 mph
September 06, sunday
0000
81°F
SW
12 mph
12 mph
0300
86°F
NW
11 mph
11 mph
