S
M
T
W
T
F
S
29
51°
43°
30
57°
42°
1
56°
43°
2
56°
42°
3
59°
41°
4
49°
38°
5
54°
40°
6
54°
40°
7
53°
37°
8
46°
35°
9
44°
30°
10
43°
31°
11
43°
35°
12
44°
34°
13
46°
34°
14
40°
26°
15
43°
28°
16
44°
35°
17
47°
36°
18
44°
37°
19
51°
30°
20
48°
22°
21
42°
23°
22
39°
24°
23
39°
30°
24
40°
29°
25
53°
29°
26
44°
24°
27
41°
22°
28
38°
22°
29
39°
23°
30
42°
36°
31
52°
28°
1
56°
22°
2
41°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Washington
Washington's December 2026 forecast shows daily high temperatures ranging from 38° to 59°, with overnight lows between 19° and 43°. The average high for December is 47° with an average low of 32°. 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 Washington. See also: January | February | March.
