S
M
T
W
T
F
S
30
93°
55°
31
87°
47°
1
79°
57°
2
96°
54°
3
93°
59°
4
97°
55°
5
92°
58°
6
90°
66°
7
87°
54°
8
80°
50°
9
76°
50°
10
83°
52°
11
80°
42°
12
64°
38°
13
60°
39°
14
64°
40°
15
73°
44°
16
77°
48°
17
76°
45°
18
74°
46°
19
71°
41°
20
63°
44°
21
75°
49°
22
75°
47°
23
74°
47°
24
65°
46°
25
70°
47°
26
68°
46°
27
73°
45°
28
69°
43°
29
63°
36°
30
56°
34°
1
58°
31°
2
55°
30°
3
57°
36°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mount Rushmore Ut
Mount Rushmore Ut's September 2026 forecast shows daily high temperatures ranging from 55° to 90°, with overnight lows between 30° and 66°. The average high for September is 71° with an average low of 44°. 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 Mount Rushmore Ut. See also: October | November | December.
