S
M
T
W
T
F
S
30
77°
55°
31
79°
56°
1
79°
50°
2
74°
50°
3
70°
51°
4
70°
50°
5
71°
49°
6
72°
56°
7
76°
59°
8
80°
53°
9
76°
49°
10
71°
49°
11
71°
56°
12
73°
48°
13
73°
48°
14
69°
46°
15
68°
48°
16
69°
55°
17
73°
46°
18
68°
47°
19
67°
45°
20
71°
44°
21
66°
47°
22
65°
54°
23
75°
54°
24
75°
52°
25
73°
53°
26
72°
53°
27
75°
51°
28
73°
50°
29
70°
52°
30
71°
52°
1
73°
41°
2
73°
39°
3
61°
40°
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 61° to 80°, with overnight lows between 39° and 59°. The average high for September is 72° with an average low of 50°. 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.
