S
M
T
W
T
F
S
30
80°
51°
31
79°
51°
1
78°
50°
2
77°
52°
3
78°
53°
4
76°
53°
5
79°
50°
6
78°
51°
7
76°
50°
8
77°
48°
9
75°
49°
10
76°
55°
11
76°
48°
12
78°
48°
13
80°
47°
14
78°
53°
15
78°
52°
16
76°
47°
17
73°
46°
18
74°
46°
19
74°
51°
20
75°
52°
21
78°
50°
22
74°
50°
23
78°
49°
24
77°
47°
25
75°
49°
26
70°
41°
27
76°
43°
28
68°
42°
29
67°
42°
30
67°
41°
1
Hist. Avg.
68°
46°
2
Hist. Avg.
67°
45°
3
Hist. Avg.
67°
45°
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 67° to 80°, with overnight lows between 41° and 55°. The average high for September is 76° 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 September weather will actually feel in Acton. See also: October | November | December.
