S
M
T
W
T
F
S
30
93°
60°
31
91°
61°
1
92°
60°
2
91°
56°
3
90°
53°
4
93°
56°
5
95°
60°
6
89°
56°
7
86°
50°
8
85°
48°
9
86°
53°
10
89°
53°
11
93°
55°
12
92°
53°
13
92°
56°
14
94°
56°
15
93°
53°
16
90°
50°
17
91°
53°
18
90°
56°
19
92°
55°
20
90°
54°
21
89°
55°
22
87°
53°
23
84°
53°
24
77°
52°
25
80°
52°
26
83°
50°
27
82°
51°
28
83°
52°
29
81°
52°
30
79°
50°
1
76°
50°
2
77°
45°
3
74°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Grand Canyon Caverns
Grand Canyon Caverns's September 2026 forecast shows daily high temperatures ranging from 74° to 95°, with overnight lows between 45° and 61°. The average high for September is 87° with an average low of 53°. 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 Canyon Caverns. See also: October | November | December.
