S
M
T
W
T
F
S
30
89°
54°
31
88°
54°
1
88°
52°
2
84°
51°
3
81°
52°
4
85°
50°
5
86°
47°
6
82°
43°
7
75°
45°
8
77°
49°
9
80°
45°
10
74°
46°
11
75°
49°
12
83°
45°
13
82°
40°
14
73°
39°
15
71°
38°
16
71°
39°
17
72°
43°
18
78°
38°
19
78°
42°
20
71°
45°
21
78°
45°
22
80°
44°
23
79°
46°
24
80°
46°
25
79°
45°
26
78°
45°
27
79°
42°
28
75°
41°
29
67°
42°
30
72°
37°
1
69°
39°
2
68°
41°
3
73°
41°
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 67° to 89°, with overnight lows between 37° and 54°. The average high for September is 78° with an average low of 45°. 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.
