S
M
T
W
T
F
S
30
90°
79°
31
89°
78°
1
90°
78°
2
88°
78°
3
88°
77°
4
87°
77°
5
86°
76°
6
87°
77°
7
86°
77°
8
86°
76°
9
87°
77°
10
85°
77°
11
85°
78°
12
87°
78°
13
88°
77°
14
90°
75°
15
90°
75°
16
88°
75°
17
89°
74°
18
88°
75°
19
90°
73°
20
89°
74°
21
87°
73°
22
87°
73°
23
88°
74°
24
87°
73°
25
88°
73°
26
86°
74°
27
86°
72°
28
87°
74°
29
85°
73°
30
85°
73°
1
86°
72°
2
86°
72°
3
87°
73°
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 72° and 79°. 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.
