S
M
T
W
T
F
S
30
85°
50°
31
78°
54°
1
71°
60°
2
78°
56°
3
77°
61°
4
85°
58°
5
73°
52°
6
69°
47°
7
80°
42°
8
81°
47°
9
80°
50°
10
86°
66°
11
78°
46°
12
78°
39°
13
69°
56°
14
74°
44°
15
71°
38°
16
79°
43°
17
81°
59°
18
79°
60°
19
66°
41°
20
63°
48°
21
67°
51°
22
62°
49°
23
62°
50°
24
62°
48°
25
64°
54°
26
64°
51°
27
66°
52°
28
70°
48°
29
69°
51°
30
70°
49°
1
68°
49°
2
69°
46°
3
65°
50°
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 62° to 70°, with overnight lows between 46° and 54°. The average high for September is 66° with an average low of 50°. 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.
