S
M
T
W
T
F
S
29
45°
34°
30
44°
34°
1
46°
41°
2
51°
41°
3
49°
39°
4
49°
37°
5
50°
35°
6
51°
35°
7
49°
37°
8
50°
40°
9
50°
40°
10
49°
35°
11
49°
34°
12
48°
36°
13
49°
41°
14
46°
38°
15
53°
38°
16
47°
41°
17
48°
39°
18
49°
40°
19
50°
39°
20
49°
40°
21
47°
41°
22
49°
40°
23
50°
37°
24
47°
33°
25
48°
31°
26
47°
32°
27
42°
31°
28
41°
34°
29
42°
31°
30
42°
39°
31
47°
41°
1
51°
35°
2
50°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Cosmopolis
Cosmopolis's December 2026 forecast shows daily high temperatures ranging from 41° to 53°, with overnight lows between 31° and 41°. The average high for December is 48° with an average low of 37°. 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 Cosmopolis. See also: January | February | March.
