S
M
T
W
T
F
S
30
89°
63°
31
90°
63°
1
90°
60°
2
84°
56°
3
83°
57°
4
83°
56°
5
84°
56°
6
83°
56°
7
87°
58°
8
88°
59°
9
89°
61°
10
88°
56°
11
87°
62°
12
87°
60°
13
88°
58°
14
85°
56°
15
82°
53°
16
80°
54°
17
79°
57°
18
83°
57°
19
82°
57°
20
Hist. Avg.
80°
51°
21
Hist. Avg.
80°
50°
22
Hist. Avg.
79°
50°
23
Hist. Avg.
78°
50°
24
Hist. Avg.
78°
49°
25
Hist. Avg.
78°
49°
26
Hist. Avg.
77°
48°
27
Hist. Avg.
76°
48°
28
Hist. Avg.
76°
47°
29
Hist. Avg.
76°
47°
30
Hist. Avg.
75°
46°
1
Hist. Avg.
74°
46°
2
Hist. Avg.
74°
46°
3
Hist. Avg.
73°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Grand Junction
Grand Junction's September 2026 forecast shows daily high temperatures ranging from 79° to 90°, with overnight lows between 53° and 63°. The average high for September is 85° with an average low of 58°. 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.
