S
M
T
W
T
F
S
30
80°
61°
31
81°
61°
1
80°
59°
2
77°
58°
3
77°
59°
4
79°
59°
5
80°
58°
6
81°
59°
7
81°
60°
8
80°
60°
9
80°
58°
10
75°
58°
11
79°
59°
12
78°
59°
13
79°
56°
14
69°
47°
15
69°
48°
16
70°
52°
17
72°
53°
18
68°
46°
19
70°
51°
20
76°
54°
21
76°
54°
22
75°
50°
23
75°
44°
24
68°
45°
25
72°
51°
26
73°
53°
27
69°
48°
28
71°
42°
29
64°
43°
30
67°
47°
1
65°
50°
2
67°
52°
3
72°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Wyoming
Wyoming's September 2026 forecast shows daily high temperatures ranging from 64° to 81°, with overnight lows between 42° and 61°. The average high for September is 74° with an average low of 53°. 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 Wyoming. See also: October | November | December.
