S
M
T
W
T
F
S
29
47°
38°
30
49°
38°
1
48°
35°
2
48°
36°
3
43°
36°
4
46°
35°
5
47°
35°
6
43°
33°
7
38°
31°
8
36°
27°
9
34°
29°
10
38°
32°
11
41°
34°
12
40°
34°
13
41°
33°
14
34°
25°
15
34°
27°
16
38°
30°
17
41°
31°
18
37°
27°
19
36°
22°
20
34°
20°
21
32°
19°
22
31°
25°
23
35°
28°
24
35°
28°
25
36°
18°
26
34°
14°
27
29°
13°
28
28°
13°
29
28°
16°
30
29°
26°
31
30°
21°
1
35°
16°
2
29°
13°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in St. Joseph
St. Joseph's December 2026 forecast shows daily high temperatures ranging from 28° to 49°, with overnight lows between 13° and 38°. The average high for December is 37° with an average low of 27°. 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 St. Joseph. See also: January | February | March.
