S
M
T
W
T
F
S
30
101°
76°
31
101°
74°
1
98°
72°
2
102°
75°
3
103°
76°
4
101°
73°
5
100°
73°
6
101°
74°
7
101°
76°
8
101°
77°
9
105°
73°
10
95°
71°
11
100°
72°
12
99°
69°
13
93°
64°
14
89°
65°
15
88°
63°
16
95°
67°
17
92°
64°
18
90°
62°
19
83°
56°
20
77°
62°
21
87°
63°
22
86°
62°
23
84°
62°
24
76°
61°
25
77°
61°
26
80°
60°
27
81°
60°
28
77°
59°
29
74°
57°
30
82°
48°
1
70°
47°
2
71°
46°
3
70°
47°
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 70° to 105°, with overnight lows between 46° and 77°. The average high for September is 87° with an average low of 62°. 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.
