S
M
T
W
T
F
S
29
53°
44°
30
61°
44°
1
60°
43°
2
58°
37°
3
49°
33°
4
53°
36°
5
57°
42°
6
53°
37°
7
48°
34°
8
47°
28°
9
47°
31°
10
48°
31°
11
47°
29°
12
47°
30°
13
48°
27°
14
49°
29°
15
49°
36°
16
51°
37°
17
50°
35°
18
56°
31°
19
53°
27°
20
48°
26°
21
46°
26°
22
47°
29°
23
51°
30°
24
47°
27°
25
46°
26°
26
46°
26°
27
47°
27°
28
46°
26°
29
46°
30°
30
49°
29°
31
50°
26°
1
46°
22°
2
45°
21°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Somerville
Somerville's December 2026 forecast shows daily high temperatures ranging from 45° to 61°, with overnight lows between 21° and 44°. The average high for December is 50° 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 Somerville. See also: January | February | March.
