Measurements:
°C
°F
CURRENT WEATHER
09:38
Key Largo
88°F
W 11 mph
Feels like: 96°F
Precip: 19%
World Resorts USA Key Largo Weather

7 Day Weather Forecast

09.15
tue
DAY
88°F
W 7 mph
precip
9%
NIGHT
88°F
W 15 mph
precip
57%
09.16
wed
DAY
88°F
W 16 mph
precip
22%
NIGHT
88°F
W 19 mph
precip
43%
09.17
thu
DAY
88°F
W 11 mph
precip
33%
NIGHT
88°F
NW 19 mph
precip
11%
09.18
fri
DAY
88°F
NW 13 mph
precip
16%
NIGHT
86°F
NW 16 mph
precip
62%
09.19
sat
DAY
88°F
W 8 mph
precip
36%
NIGHT
86°F
NW 10 mph
precip
38%
09.20
sun
DAY
86°F
NW 6 mph
precip
58%
NIGHT
86°F
W 14 mph
precip
60%
09.21
mon
DAY
84°F
N 12 mph
precip
72%
NIGHT
88°F
W 14 mph
precip
26%

Key Largo Sea Water Temperature in September, °F

Select Year: 2026 2025 2024

The average sea surface temperature in September 2026 for Key Largo was 31.0°F. The maximum and minimum values were 30.5°F and 31.4°F respectively.

Key Largo on the Weather Map

Best Time to Visit Key Largo
The most sunny months:
December 12 days
February 12 days
March 12 days
The most warm months:
August 89.8 °F
July 89.3 °F
September 88.4 °F
Warmest sea temperature:
August 91.9 °F
July 91.4 °F
September 90.7 °F
The most cold months:
January 72.9 °F
February 75.2 °F
December 75.6 °F
The most rainy months:
June 3 days
September 3 days
July 3 days
The most windy months:
March 14 mph
November 14 mph
April 13 mph
more details