S
M
T
W
T
F
S
29
45°
16°
30
40°
10°
1
32°
16°
2
29°
17°
3
35°
17°
4
33°
13°
5
31°
21°
6
32°
24°
7
39°
24°
8
39°
21°
9
38°
21°
10
36°
18°
11
38°
14°
12
32°
9°
13
26°
6°
14
24°
15°
15
30°
22°
16
37°
19°
17
Hist. Avg.
31°
13°
18
Hist. Avg.
30°
13°
19
Hist. Avg.
30°
12°
20
Hist. Avg.
30°
12°
21
Hist. Avg.
30°
12°
22
Hist. Avg.
29°
12°
23
Hist. Avg.
29°
11°
24
Hist. Avg.
29°
11°
25
Hist. Avg.
29°
11°
26
Hist. Avg.
28°
11°
27
Hist. Avg.
28°
10°
28
Hist. Avg.
28°
10°
29
Hist. Avg.
28°
10°
30
Hist. Avg.
28°
10°
31
Hist. Avg.
28°
10°
1
Hist. Avg.
27°
10°
2
Hist. Avg.
27°
10°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Sioux Falls
Sioux Falls's December 2026 forecast shows daily high temperatures ranging from 24° to 45°, with overnight lows between 6° and 24°. The average high for December is 34° with an average low of 17°. 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 Sioux Falls. See also: January | February | March.
