S
M
T
W
T
F
S
29
44°
21°
30
43°
28°
1
54°
25°
2
54°
28°
3
46°
30°
4
54°
19°
5
55°
22°
6
40°
18°
7
41°
22°
8
42°
17°
9
42°
14°
10
38°
14°
11
35°
15°
12
36°
14°
13
36°
16°
14
37°
15°
15
36°
16°
16
36°
18°
17
38°
19°
18
38°
24°
19
39°
27°
20
42°
25°
21
42°
20°
22
41°
18°
23
37°
18°
24
36°
20°
25
37°
24°
26
42°
22°
27
40°
20°
28
39°
19°
29
38°
18°
30
38°
17°
31
41°
10°
1
Hist. Avg.
37°
20°
2
Hist. Avg.
37°
20°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
December Weather in Acton
Acton's December 2026 forecast shows daily high temperatures ranging from 35° to 55°, with overnight lows between 10° and 30°. The average high for December is 41° with an average low of 20°. 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 Acton. See also: January | February | March.
