S
M
T
W
T
F
S
30
90°
72°
31
88°
73°
1
90°
73°
2
91°
73°
3
93°
75°
4
93°
75°
5
95°
73°
6
93°
73°
7
91°
75°
8
90°
73°
9
93°
75°
10
91°
73°
11
91°
73°
12
93°
75°
13
91°
72°
14
93°
73°
15
90°
76°
16
88°
76°
17
88°
73°
18
88°
72°
19
87°
73°
20
90°
72°
21
89°
73°
22
90°
74°
23
88°
73°
24
87°
72°
25
88°
73°
26
89°
72°
27
86°
74°
28
87°
72°
29
86°
73°
30
86°
74°
1
87°
74°
2
86°
73°
3
86°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Clewiston
Clewiston's September 2026 forecast shows daily high temperatures ranging from 86° to 90°, with overnight lows between 72° and 76°. The average high for September is 88° with an average low of 73°. 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 Clewiston. See also: October | November | December.
