S
M
T
W
T
F
S
30
93°
55°
31
87°
47°
1
79°
57°
2
96°
54°
3
93°
59°
4
97°
57°
5
90°
63°
6
89°
65°
7
84°
54°
8
76°
50°
9
79°
47°
10
85°
52°
11
84°
50°
12
77°
46°
13
76°
49°
14
73°
50°
15
76°
51°
16
80°
46°
17
76°
46°
18
72°
41°
19
74°
43°
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 65°. The average high for September is 73° with an average low of 46°. 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.
