S
M
T
W
T
F
S
30
80°
59°
31
85°
67°
1
90°
70°
2
91°
70°
3
88°
66°
4
76°
64°
5
77°
56°
6
77°
53°
7
77°
55°
8
80°
55°
9
86°
69°
10
81°
64°
11
77°
59°
12
72°
57°
13
83°
63°
14
69°
50°
15
80°
51°
16
81°
65°
17
78°
68°
18
75°
58°
19
68°
58°
20
70°
55°
21
60°
54°
22
60°
55°
23
59°
49°
24
64°
44°
25
64°
43°
26
67°
44°
27
66°
46°
28
63°
47°
29
67°
48°
30
65°
47°
1
65°
48°
2
64°
45°
3
62°
52°
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 59° to 70°, with overnight lows between 43° and 55°. The average high for September is 64° with an average low of 48°. 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.
