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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Key Largo, FL
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September
Average Temperature
High
30°
Feels 36
Low
27°
Feels 31
Average Precipitation
17 Days
Rain amount
130mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
31°
2
30°
3
29°
4
29°
5
29°
6
28°
7
29°
8
29°
9
30°
10
30°
11
29°
12
30°
13
30°
14
29°
15
29°
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Tuesday, September 1, 2026
Day
31°
Feels 39
Wind
8 km/h E
Gust
12 km/h
Humidity
71%
P.O.P
40%
Rain
~1 mm
Night
28°
Feels 32
Wind
15 km/h SE
Gust
23 km/h
Humidity
81%
P.O.P
40%
Rain
<1 mm
Historical Averages
Sep 1
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.