S
M
T
W
T
F
S
26
61°
38°
27
67°
32°
28
62°
34°
29
59°
45°
30
54°
45°
1
63°
43°
2
57°
46°
3
56°
40°
4
69°
50°
5
79°
58°
6
68°
52°
7
61°
44°
8
61°
40°
9
63°
43°
10
63°
40°
11
66°
43°
12
67°
47°
13
68°
46°
14
67°
47°
15
69°
48°
16
70°
46°
17
76°
51°
18
76°
51°
19
75°
50°
20
71°
50°
21
71°
51°
22
72°
51°
23
71°
47°
24
68°
47°
25
70°
48°
26
70°
52°
27
71°
50°
28
70°
48°
29
70°
46°
30
71°
50°
31
72°
54°
1
75°
52°
2
74°
49°
3
72°
54°
4
76°
54°
5
73°
53°
6
73°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Acton
Acton's May 2026 forecast shows daily high temperatures ranging from 56° to 79°, with overnight lows between 40° and 58°. The average high for May is 70° with an average low of 49°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Acton. See also: June | July | August.
