S
M
T
W
T
F
S
29
51°
43°
30
56°
40°
1
55°
33°
2
53°
29°
3
43°
31°
4
42°
37°
5
48°
33°
6
46°
30°
7
42°
37°
8
50°
33°
9
50°
30°
10
42°
26°
11
39°
23°
12
37°
22°
13
35°
27°
14
38°
21°
15
37°
21°
16
33°
22°
17
35°
24°
18
44°
23°
19
43°
27°
20
36°
31°
21
40°
32°
22
41°
29°
23
40°
29°
24
38°
32°
25
48°
31°
26
49°
29°
27
44°
31°
28
Hist. Avg.
39°
26°
29
Hist. Avg.
39°
26°
30
Hist. Avg.
39°
26°
31
Hist. Avg.
38°
25°
1
Hist. Avg.
38°
25°
2
Hist. Avg.
38°
25°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
December Weather in Boston
Boston's December 2026 forecast shows daily high temperatures ranging from 33° to 56°, with overnight lows between 21° and 43°. The average high for December is 43° with an average low of 30°. 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 Boston. See also: January | February | March.
