S
M
T
W
T
F
S
30
88°
79°
31
89°
80°
1
89°
78°
2
88°
79°
3
89°
78°
4
90°
79°
5
90°
78°
6
89°
79°
7
89°
78°
8
90°
79°
9
88°
78°
10
89°
78°
11
88°
76°
12
86°
78°
13
87°
78°
14
88°
77°
15
88°
77°
16
89°
78°
17
87°
78°
18
88°
77°
19
88°
77°
20
87°
78°
21
89°
79°
22
90°
78°
23
89°
78°
24
88°
77°
25
88°
77°
26
87°
78°
27
85°
76°
28
87°
75°
29
85°
76°
30
85°
75°
1
87°
76°
2
87°
76°
3
87°
78°
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 85° to 90°, with overnight lows between 75° and 80°. The average high for September is 88° with an average low of 78°. 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.
