S
M
T
W
T
F
S
30
80°
50°
31
83°
51°
1
80°
49°
2
79°
53°
3
86°
53°
4
87°
51°
5
88°
48°
6
84°
46°
7
78°
47°
8
77°
43°
9
77°
44°
10
76°
47°
11
80°
46°
12
77°
47°
13
75°
49°
14
76°
50°
15
83°
38°
16
83°
37°
17
73°
36°
18
70°
35°
19
70°
37°
20
71°
40°
21
73°
44°
22
77°
44°
23
79°
39°
24
71°
35°
25
69°
34°
26
67°
35°
27
66°
34°
28
67°
33°
29
66°
35°
30
67°
39°
1
Hist. Avg.
70°
40°
2
Hist. Avg.
69°
40°
3
Hist. Avg.
69°
39°
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 66° to 88°, with overnight lows between 33° and 53°. The average high for September is 76° with an average low of 43°. 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.
