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7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Key West, FL
Content continues below
September
Average Temperature
High
31°
Feels 36
Low
26°
Feels 30
Average Precipitation
17 Days
Rain amount
157.6mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
30°
24
31°
25
29°
26
32°
27
31°
28
31°
29
31°
30
31°
Forecast
Wednesday, September 23, 2026
Day
30°
Feels 37
Wind
13 km/h W
Gust
20 km/h
Humidity
74%
P.O.P
80%
Rain
2-4 mm
Night
27°
Feels 30
Wind
10 km/h NW
Gust
15 km/h
Humidity
81%
P.O.P
40%
Rain
<1 mm
Historical Averages
Sep 23
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.