S
M
T
W
T
F
S
30
90°
54°
31
85°
52°
1
86°
59°
2
92°
51°
3
92°
57°
4
94°
56°
5
96°
57°
6
85°
56°
7
89°
65°
8
82°
57°
9
74°
54°
10
86°
56°
11
89°
49°
12
75°
58°
13
83°
56°
14
83°
48°
15
65°
51°
16
74°
50°
17
71°
51°
18
78°
50°
19
79°
48°
20
76°
47°
21
75°
46°
22
72°
44°
23
66°
30°
24
74°
48°
25
78°
46°
26
76°
46°
27
78°
47°
28
77°
45°
29
64°
44°
30
74°
42°
1
71°
44°
2
75°
43°
3
74°
43°
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 64° to 89°, with overnight lows between 30° and 58°. The average high for September is 76° with an average low of 47°. 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.
