S
M
T
W
T
F
S
30
77°
51°
31
67°
48°
1
75°
49°
2
76°
44°
3
78°
44°
4
76°
44°
5
78°
46°
6
78°
49°
7
77°
50°
8
81°
48°
9
79°
47°
10
76°
46°
11
71°
42°
12
75°
43°
13
75°
42°
14
72°
43°
15
73°
33°
16
74°
39°
17
74°
38°
18
72°
38°
19
66°
35°
20
63°
28°
21
63°
30°
22
70°
32°
23
72°
37°
24
69°
36°
25
63°
28°
26
61°
25°
27
65°
27°
28
68°
30°
29
68°
29°
30
69°
30°
1
67°
27°
2
67°
27°
3
69°
28°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Gunnison
Gunnison's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 25° and 50°. The average high for September is 71° with an average low of 37°. 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 Gunnison. See also: October | November | December.
