S
M
T
W
T
F
S
29
53°
40°
30
55°
40°
1
53°
37°
2
49°
34°
3
43°
34°
4
50°
33°
5
53°
38°
6
47°
36°
7
41°
28°
8
39°
25°
9
38°
25°
10
41°
31°
11
44°
36°
12
45°
31°
13
45°
30°
14
39°
23°
15
39°
28°
16
40°
32°
17
44°
31°
18
44°
28°
19
41°
22°
20
38°
21°
21
35°
21°
22
35°
26°
23
39°
29°
24
39°
28°
25
37°
20°
26
37°
18°
27
35°
19°
28
34°
19°
29
34°
20°
30
35°
24°
31
37°
19°
1
36°
16°
2
34°
13°
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 34° to 55°, with overnight lows between 13° and 40°. The average high for December is 41° with an average low of 27°. 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.
