S
M
T
W
T
F
S
29
41°
25°
30
35°
20°
1
27°
18°
2
27°
20°
3
36°
23°
4
40°
23°
5
31°
22°
6
32°
20°
7
25°
16°
8
25°
20°
9
36°
21°
10
38°
21°
11
38°
20°
12
37°
20°
13
36°
21°
14
26°
18°
15
32°
17°
16
32°
15°
17
31°
11°
18
29°
8°
19
25°
3°
20
20°
2°
21
18°
15°
22
30°
15°
23
31°
9°
24
30°
4°
25
26°
14°
26
27°
16°
27
31°
16°
28
32°
13°
29
31°
11°
30
28°
7°
31
26°
-2°
1
24°
-2°
2
16°
9°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Rushmore
Rushmore's December 2026 forecast shows daily high temperatures ranging from 16° to 41°, with overnight lows between -2° and 25°. The average high for December is 30° with an average low of 15°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how December weather will actually feel in Rushmore. See also: January | February | March.
