S
M
T
W
T
F
S
30
74°
52°
31
74°
58°
1
75°
60°
2
79°
59°
3
75°
51°
4
73°
50°
5
71°
51°
6
71°
52°
7
74°
56°
8
78°
56°
9
79°
58°
10
79°
51°
11
72°
53°
12
71°
56°
13
71°
48°
14
70°
50°
15
67°
48°
16
68°
47°
17
69°
53°
18
73°
45°
19
69°
46°
20
69°
45°
21
72°
46°
22
68°
52°
23
73°
53°
24
75°
53°
25
72°
52°
26
74°
54°
27
74°
53°
28
76°
50°
29
72°
50°
30
71°
52°
1
73°
51°
2
74°
42°
3
72°
39°
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 67° to 79°, with overnight lows between 39° and 60°. The average high for September is 73° with an average low of 51°. 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.
