S
M
T
W
T
F
S
30
88°
78°
31
87°
77°
1
86°
78°
2
87°
78°
3
87°
77°
4
88°
77°
5
85°
76°
6
87°
77°
7
87°
77°
8
88°
76°
9
86°
76°
10
87°
77°
11
89°
76°
12
90°
74°
13
87°
74°
14
88°
75°
15
90°
74°
16
89°
75°
17
88°
74°
18
88°
74°
19
87°
75°
20
88°
75°
21
88°
73°
22
87°
73°
23
86°
74°
24
86°
76°
25
87°
76°
26
88°
75°
27
86°
74°
28
86°
72°
29
88°
71°
30
88°
73°
1
87°
72°
2
86°
71°
3
85°
72°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Upper Captiva
Upper Captiva's September 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 71° and 78°. The average high for September is 87° with an average low of 75°. 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 Upper Captiva. See also: October | November | December.
