S
M
T
W
T
F
S
30
107°
86°
31
99°
85°
1
103°
81°
2
104°
85°
3
106°
82°
4
106°
86°
5
103°
82°
6
107°
82°
7
102°
78°
8
102°
80°
9
102°
80°
10
102°
80°
11
100°
80°
12
96°
79°
13
98°
79°
14
89°
75°
15
88°
74°
16
95°
78°
17
97°
79°
18
105°
78°
19
105°
79°
20
100°
74°
21
91°
69°
22
92°
68°
23
94°
70°
24
93°
70°
25
93°
69°
26
98°
73°
27
94°
70°
28
89°
66°
29
89°
70°
30
94°
64°
1
88°
65°
2
91°
68°
3
92°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Why
Why's September 2026 forecast shows daily high temperatures ranging from 88° to 105°, with overnight lows between 64° and 80°. The average high for September is 96° 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 Why. See also: October | November | December.
