S
M
T
W
T
F
S
30
91°
62°
31
92°
63°
1
90°
62°
2
92°
62°
3
91°
61°
4
85°
59°
5
83°
59°
6
83°
58°
7
84°
56°
8
82°
57°
9
81°
58°
10
81°
57°
11
82°
52°
12
79°
54°
13
80°
53°
14
79°
57°
15
80°
56°
16
80°
51°
17
78°
50°
18
77°
51°
19
78°
49°
20
78°
50°
21
80°
54°
22
81°
52°
23
82°
56°
24
76°
54°
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 76° to 92°, with overnight lows between 49° and 63°. The average high for September is 83° 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.
