S
M
T
W
T
F
S
30
95°
65°
31
89°
65°
1
87°
59°
2
85°
50°
3
85°
59°
4
85°
60°
5
90°
52°
6
71°
63°
7
87°
63°
8
90°
66°
9
100°
66°
10
102°
74°
11
98°
74°
12
94°
70°
13
93°
62°
14
93°
54°
15
89°
59°
16
80°
56°
17
80°
54°
18
86°
52°
19
89°
61°
20
85°
59°
21
87°
62°
22
87°
65°
23
91°
64°
24
89°
62°
25
90°
62°
26
88°
61°
27
86°
59°
28
89°
57°
29
86°
58°
30
83°
57°
1
81°
56°
2
83°
57°
3
83°
59°
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 80° to 91°, with overnight lows between 52° and 65°. The average high for September is 86° with an average low of 59°. 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.
