S
M
T
W
T
F
S
29
49°
27°
30
38°
21°
1
34°
17°
2
35°
26°
3
43°
26°
4
42°
25°
5
39°
25°
6
38°
22°
7
32°
20°
8
33°
24°
9
44°
25°
10
47°
25°
11
46°
24°
12
45°
23°
13
46°
24°
14
38°
21°
15
38°
22°
16
38°
16°
17
39°
12°
18
36°
8°
19
34°
6°
20
27°
11°
21
31°
18°
22
39°
16°
23
39°
16°
24
36°
15°
25
36°
19°
26
39°
20°
27
42°
20°
28
38°
15°
29
37°
15°
30
36°
7°
31
32°
5°
1
27°
12°
2
30°
19°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Sumner
Sumner's December 2026 forecast shows daily high temperatures ranging from 27° to 49°, with overnight lows between 5° and 27°. The average high for December is 38° with an average low of 18°. 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 Sumner. See also: January | February | March.
