S
M
T
W
T
F
S
29
37°
19°
30
32°
14°
1
33°
22°
2
38°
27°
3
40°
27°
4
37°
26°
5
35°
26°
6
33°
17°
7
31°
17°
8
37°
24°
9
42°
22°
10
41°
23°
11
43°
22°
12
41°
23°
13
43°
24°
14
36°
23°
15
32°
22°
16
38°
11°
17
34°
17°
18
30°
11°
19
29°
23°
20
36°
20°
21
36°
14°
22
33°
20°
23
33°
15°
24
36°
18°
25
32°
23°
26
37°
11°
27
37°
3°
28
28°
11°
29
25°
7°
30
31°
6°
31
27°
20°
1
32°
24°
2
37°
17°
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 25° to 43°, with overnight lows between 3° and 27°. The average high for December is 35° with an average low of 19°. 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.
