S
M
T
W
T
F
S
29
46°
37°
30
49°
38°
1
51°
39°
2
50°
37°
3
52°
36°
4
44°
33°
5
48°
33°
6
49°
35°
7
49°
33°
8
41°
30°
9
39°
26°
10
37°
26°
11
36°
32°
12
38°
31°
13
41°
31°
14
35°
23°
15
38°
25°
16
37°
30°
17
40°
31°
18
38°
32°
19
46°
28°
20
42°
19°
21
36°
20°
22
32°
22°
23
30°
26°
24
35°
25°
25
45°
25°
26
41°
20°
27
35°
17°
28
32°
18°
29
33°
18°
30
34°
31°
31
44°
26°
1
48°
19°
2
38°
18°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Richland
Richland's December 2026 forecast shows daily high temperatures ranging from 30° to 52°, with overnight lows between 17° and 39°. The average high for December is 41° with an average low of 28°. 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 Richland. See also: January | February | March.
