S
M
T
W
T
F
S
30
83°
55°
31
79°
56°
1
70°
59°
2
75°
59°
3
77°
61°
4
82°
57°
5
73°
54°
6
72°
50°
7
79°
55°
8
82°
56°
9
78°
64°
10
88°
54°
11
77°
51°
12
73°
50°
13
76°
52°
14
78°
52°
15
78°
51°
16
78°
51°
17
80°
49°
18
72°
47°
19
77°
52°
20
76°
51°
21
74°
49°
22
73°
51°
23
74°
51°
24
75°
50°
25
71°
49°
26
75°
51°
27
75°
52°
28
76°
48°
29
69°
44°
30
70°
47°
1
69°
45°
2
66°
46°
3
65°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Acton
Acton's September 2026 forecast shows daily high temperatures ranging from 65° to 88°, with overnight lows between 44° and 64°. The average high for September is 75° with an average low of 51°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Acton. See also: October | November | December.
