S
M
T
W
T
F
S
29
40°
28°
30
39°
28°
1
40°
34°
2
44°
37°
3
45°
34°
4
45°
31°
5
44°
30°
6
43°
31°
7
40°
32°
8
40°
33°
9
42°
32°
10
40°
28°
11
41°
28°
12
40°
29°
13
43°
31°
14
41°
32°
15
47°
32°
16
46°
35°
17
42°
32°
18
46°
34°
19
47°
35°
20
45°
33°
21
44°
35°
22
46°
35°
23
45°
33°
24
44°
32°
25
44°
26°
26
43°
25°
27
36°
25°
28
34°
29°
29
37°
25°
30
37°
32°
31
39°
36°
1
44°
33°
2
46°
30°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Mosier
Mosier's December 2026 forecast shows daily high temperatures ranging from 34° to 47°, with overnight lows between 25° and 37°. The average high for December is 42° 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 Mosier. See also: January | February | March.
