S
M
T
W
T
F
S
29
49°
35°
30
50°
35°
1
48°
33°
2
47°
33°
3
45°
32°
4
48°
32°
5
47°
31°
6
40°
29°
7
37°
24°
8
33°
21°
9
33°
24°
10
39°
28°
11
41°
30°
12
44°
29°
13
39°
29°
14
34°
24°
15
38°
24°
16
39°
27°
17
40°
26°
18
36°
21°
19
37°
19°
20
32°
14°
21
31°
15°
22
29°
20°
23
37°
24°
24
35°
22°
25
35°
12°
26
34°
10°
27
29°
9°
28
28°
9°
29
28°
15°
30
29°
19°
31
28°
13°
1
35°
9°
2
27°
8°
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 27° to 50°, with overnight lows between 8° and 35°. The average high for December is 37° with an average low of 22°. 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.
