S
M
T
W
T
F
S
30
90°
68°
31
89°
66°
1
85°
64°
2
87°
65°
3
90°
77°
4
92°
67°
5
88°
68°
6
74°
63°
7
82°
63°
8
79°
51°
9
79°
49°
10
80°
62°
11
85°
55°
12
73°
50°
13
67°
56°
14
64°
48°
15
68°
47°
16
70°
50°
17
66°
47°
18
68°
48°
19
70°
49°
20
72°
47°
21
71°
46°
22
76°
54°
23
75°
54°
24
76°
53°
25
71°
52°
26
67°
53°
27
74°
53°
28
73°
52°
29
70°
50°
30
66°
48°
1
60°
44°
2
59°
40°
3
59°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Rushmore
Rushmore's September 2026 forecast shows daily high temperatures ranging from 59° to 85°, with overnight lows between 38° and 62°. The average high for September is 71° with an average low of 50°. 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 Rushmore. See also: October | November | December.
