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