S
M
T
W
T
F
S
30
94°
74°
31
96°
72°
1
93°
73°
2
94°
73°
3
93°
72°
4
93°
73°
5
92°
72°
6
93°
72°
7
88°
70°
8
89°
71°
9
87°
70°
10
87°
70°
11
87°
66°
12
87°
68°
13
88°
70°
14
87°
70°
15
85°
69°
16
82°
70°
17
85°
70°
18
84°
69°
19
87°
70°
20
88°
70°
21
87°
69°
22
88°
69°
23
89°
68°
24
90°
69°
25
90°
69°
26
89°
68°
27
87°
68°
28
83°
67°
29
84°
67°
30
84°
66°
1
86°
67°
2
87°
66°
3
85°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Willis
Willis's September 2026 forecast shows daily high temperatures ranging from 82° to 96°, with overnight lows between 66° and 74°. The average high for September is 88° with an average low of 70°. 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 Willis. See also: October | November | December.
