S
M
T
W
T
F
S
30
84°
56°
31
84°
56°
1
83°
55°
2
83°
56°
3
82°
55°
4
80°
55°
5
77°
54°
6
80°
54°
7
79°
53°
8
70°
51°
9
75°
53°
10
74°
53°
11
79°
52°
12
78°
53°
13
70°
47°
14
68°
51°
15
73°
52°
16
73°
49°
17
72°
47°
18
78°
52°
19
78°
45°
20
70°
44°
21
65°
43°
22
64°
46°
23
73°
49°
24
75°
46°
25
75°
48°
26
74°
46°
27
73°
41°
28
66°
35°
29
60°
34°
30
58°
37°
1
60°
39°
2
66°
44°
3
69°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Cheyenne
Cheyenne's September 2026 forecast shows daily high temperatures ranging from 58° to 84°, with overnight lows between 34° and 56°. The average high for September is 73° 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 Cheyenne. See also: October | November | December.
