S
M
T
W
T
F
S
30
91°
73°
31
90°
73°
1
89°
72°
2
90°
73°
3
91°
72°
4
85°
71°
5
85°
70°
6
87°
69°
7
89°
67°
8
90°
71°
9
90°
71°
10
89°
70°
11
90°
71°
12
89°
70°
13
88°
71°
14
88°
66°
15
90°
68°
16
89°
69°
17
90°
70°
18
89°
68°
19
88°
63°
20
83°
66°
21
82°
63°
22
84°
63°
23
85°
64°
24
87°
65°
25
87°
66°
26
83°
64°
27
82°
64°
28
84°
63°
29
80°
64°
30
84°
65°
1
82°
64°
2
83°
64°
3
85°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Alliance
Alliance's September 2026 forecast shows daily high temperatures ranging from 80° to 91°, with overnight lows between 63° and 73°. The average high for September is 87° with an average low of 68°. 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 Alliance. See also: October | November | December.
