S
M
T
W
T
F
S
30
89°
80°
31
90°
79°
1
90°
79°
2
89°
78°
3
89°
79°
4
90°
79°
5
90°
78°
6
89°
79°
7
90°
79°
8
90°
78°
9
89°
79°
10
90°
79°
11
90°
78°
12
89°
79°
13
89°
78°
14
88°
79°
15
89°
79°
16
88°
77°
17
89°
79°
18
90°
78°
19
90°
75°
20
89°
77°
21
89°
76°
22
88°
75°
23
88°
77°
24
87°
75°
25
87°
76°
26
85°
77°
27
86°
76°
28
86°
76°
29
87°
77°
30
86°
76°
1
85°
77°
2
87°
76°
3
87°
77°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Summerland Key
Summerland 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 Summerland Key. See also: October | November | December.
