S
M
T
W
T
F
S
30
89°
78°
31
88°
79°
1
88°
79°
2
90°
78°
3
90°
78°
4
89°
79°
5
89°
79°
6
88°
78°
7
89°
79°
8
89°
79°
9
90°
78°
10
90°
76°
11
88°
76°
12
87°
77°
13
88°
78°
14
89°
77°
15
88°
78°
16
88°
77°
17
89°
77°
18
89°
78°
19
90°
78°
20
90°
78°
21
89°
77°
22
89°
78°
23
88°
78°
24
89°
77°
25
88°
78°
26
89°
76°
27
89°
76°
28
88°
77°
29
89°
77°
30
88°
76°
1
87°
77°
2
88°
77°
3
87°
74°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cudjoe Key
Cudjoe Key's September 2026 forecast shows daily high temperatures ranging from 87° to 90°, with overnight lows between 74° and 79°. The average high for September is 89° with an average low of 77°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Cudjoe Key. See also: October | November | December.
