24.09
thu
thu
Day
81°F
S 4 mph
Precip.
20%
20%
Night
82°F
E 8 mph
Precip.
23%
23%
25.09
fri
fri
Day
82°F
SW 11 mph
Precip.
6%
6%
Night
81°F
SW 12 mph
Precip.
42%
42%
26.09
sat
sat
Day
81°F
SW 6 mph
Precip.
9%
9%
Night
81°F
SE 7 mph
Precip.
17%
17%
27.09
sun
sun
Day
81°F
W 6 mph
Precip.
19%
19%
Night
81°F
NW 4 mph
Precip.
6%
6%
28.09
mon
mon
Day
82°F
NW 3 mph
Precip.
18%
18%
Night
82°F
N 10 mph
Precip.
26%
26%
29.09
tue
tue
Day
84°F
W 8 mph
Precip.
17%
17%
Night
84°F
NW 13 mph
Precip.
17%
17%
30.09
wed
wed
Day
82°F
W 14 mph
Precip.
46%
46%
Night
79°F
W 20 mph
Precip.
83%
83%
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:
2026
2025
2024
The average sea water temperature in September of 2026 was 87.6°F. The highest and lowest sea temperatures during the month were 88.5°F and 86.4°F.
Sea water temperature in October, °F
Show year:
2025
2024
2023
The average sea water temperature in October of 2025 was 83.0°F. The highest and lowest sea temperatures during the month were 86.0°F and 80.2°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: 22:41
September 25, friday
0000
82°F
E
8 mph
8 mph
0300
81°F
S
14 mph
14 mph
0600
79°F
S
16 mph
16 mph
0900
79°F
S
16 mph
16 mph
1200
82°F
SW
11 mph
11 mph
1500
82°F
SW
16 mph
16 mph
1800
82°F
SW
14 mph
14 mph
2100
82°F
SW
12 mph
12 mph
