S
M
T
W
T
F
S
29
19°
7°
30
21°
6°
1
20°
6°
2
19°
6°
3
20°
8°
4
20°
8°
5
19°
7°
6
19°
6°
7
18°
5°
8
18°
5°
9
17°
6°
10
16°
-2°
11
-1°
-2°
12
12°
-2°
13
14°
-3°
14
12°
-2°
15
14°
-6°
16
13°
-7°
17
11°
-4°
18
11°
-4°
19
12°
-5°
20
11°
-6°
21
10°
-17°
22
9°
-20°
23
3°
-19°
24
0°
-24°
25
-4°
-24°
26
-6°
-14°
27
-4°
-20°
28
-3°
-20°
29
-5°
-14°
30
-5°
-9°
31
6°
-9°
1
7°
-10°
2
6°
-16°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Fort Smith
Fort Smith's December 2026 forecast shows daily high temperatures ranging from -6° to 21°, with overnight lows between -24° and 8°. The average high for December is 10° with an average low of -5°. 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 Fort Smith. See also: January | February | March.
