04.09
fri
fri
Day
81°F
NW 9 mph
Precip.
34%
34%
Night
86°F
W 12 mph
Precip.
21%
21%
05.09
sat
sat
Day
86°F
NW 7 mph
Precip.
16%
16%
Night
86°F
NW 11 mph
Precip.
17%
17%
06.09
sun
sun
Day
86°F
N 5 mph
Precip.
18%
18%
Night
86°F
N 6 mph
Precip.
5%
5%
07.09
mon
mon
Day
86°F
N 3 mph
Precip.
4%
4%
Night
86°F
W 3 mph
Precip.
27%
27%
08.09
tue
tue
Day
86°F
W 9 mph
Precip.
18%
18%
Night
86°F
W 14 mph
Precip.
6%
6%
09.09
wed
wed
Day
86°F
W 13 mph
Precip.
19%
19%
Night
86°F
W 17 mph
Precip.
9%
9%
10.09
thu
thu
Day
86°F
W 11 mph
Precip.
17%
17%
Night
86°F
W 12 mph
Precip.
22%
22%
sea water
temperature
temperature
| Key Largo |
monthly
weather
weather
| Key Largo |
current
weather
weather
| Key Largo |
14 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: 14:01
September 04, friday
1500
79°F
W
9 mph
9 mph
1800
84°F
W
9 mph
9 mph
2100
86°F
W
11 mph
11 mph
September 05, saturday
0000
86°F
W
12 mph
12 mph
0300
86°F
W
12 mph
12 mph
0600
84°F
NW
11 mph
11 mph
0900
86°F
NW
10 mph
10 mph
1200
86°F
NW
7 mph
7 mph
