S
M
T
W
T
F
S
30
90°
77°
31
90°
82°
1
90°
80°
2
90°
83°
3
91°
83°
4
91°
80°
5
90°
78°
6
91°
82°
7
89°
82°
8
91°
80°
9
90°
82°
10
89°
81°
11
90°
84°
12
90°
82°
13
91°
82°
14
90°
82°
15
89°
81°
16
88°
80°
17
88°
79°
18
87°
80°
19
88°
80°
20
89°
79°
21
88°
79°
22
89°
81°
23
88°
80°
24
89°
79°
25
88°
77°
26
85°
79°
27
85°
78°
28
85°
78°
29
83°
79°
30
85°
79°
1
85°
78°
2
86°
79°
3
84°
79°
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 83° to 91°, with overnight lows between 77° and 82°. The average high for September is 87° with an average low of 80°. 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.
