S
M
T
W
T
F
S
30
83°
62°
31
82°
61°
1
83°
57°
2
76°
55°
3
75°
57°
4
75°
56°
5
76°
53°
6
77°
60°
7
80°
60°
8
75°
59°
9
74°
58°
10
78°
58°
11
81°
58°
12
81°
59°
13
80°
59°
14
81°
49°
15
74°
49°
16
72°
50°
17
71°
49°
18
81°
55°
19
81°
56°
20
80°
54°
21
79°
49°
22
77°
46°
23
70°
45°
24
68°
45°
25
69°
53°
26
74°
53°
27
76°
52°
28
74°
52°
29
75°
51°
30
76°
52°
1
76°
52°
2
75°
45°
3
75°
43°
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 68° to 83°, with overnight lows between 43° and 62°. The average high for September is 77° with an average low of 53°. 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.
