S
M
T
W
T
F
S
30
72°
59°
31
73°
57°
1
72°
50°
2
68°
54°
3
79°
64°
4
68°
55°
5
71°
56°
6
75°
60°
7
75°
56°
8
69°
50°
9
67°
50°
10
65°
56°
11
67°
50°
12
66°
54°
13
67°
53°
14
68°
55°
15
69°
55°
16
70°
54°
17
68°
52°
18
66°
50°
19
66°
49°
20
68°
53°
21
69°
53°
22
69°
52°
23
68°
53°
24
68°
52°
25
67°
50°
26
65°
50°
27
65°
51°
28
64°
51°
29
64°
50°
30
66°
50°
1
65°
45°
2
64°
50°
3
65°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Dedham
Dedham's September 2026 forecast shows daily high temperatures ranging from 64° to 75°, with overnight lows between 45° and 60°. The average high for September is 67° with an average low of 52°. 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 Dedham. See also: October | November | December.
