S
M
T
W
T
F
S
30
79°
59°
31
73°
56°
1
81°
55°
2
83°
62°
3
90°
66°
4
91°
64°
5
90°
64°
6
84°
64°
7
84°
67°
8
85°
65°
9
88°
63°
10
85°
62°
11
86°
61°
12
86°
61°
13
85°
60°
14
84°
59°
15
83°
55°
16
86°
60°
17
86°
59°
18
80°
58°
19
77°
53°
20
74°
48°
21
74°
49°
22
79°
50°
23
83°
58°
24
74°
55°
25
73°
46°
26
71°
45°
27
73°
46°
28
77°
49°
29
78°
48°
30
79°
50°
1
78°
46°
2
77°
47°
3
78°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Junction
Grand Junction's September 2026 forecast shows daily high temperatures ranging from 71° to 91°, with overnight lows between 45° and 67°. The average high for September is 81° with an average low of 56°. 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 Grand Junction. See also: October | November | December.
