S
M
T
W
T
F
S
26
82°
59°
27
83°
60°
28
83°
60°
29
84°
59°
30
83°
60°
31
83°
66°
1
87°
66°
2
88°
65°
3
89°
66°
4
88°
65°
5
88°
58°
6
84°
58°
7
80°
59°
8
81°
59°
9
82°
60°
10
84°
61°
11
85°
64°
12
86°
59°
13
84°
64°
14
87°
63°
15
86°
65°
16
86°
63°
17
88°
60°
18
84°
58°
19
80°
57°
20
80°
57°
21
81°
59°
22
81°
63°
23
80°
59°
24
82°
60°
25
83°
63°
26
85°
61°
27
85°
56°
28
83°
59°
29
79°
60°
30
84°
61°
31
85°
62°
1
84°
61°
2
84°
60°
3
85°
55°
4
84°
52°
5
84°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Dedham
Dedham's August 2026 forecast shows daily high temperatures ranging from 79° to 89°, with overnight lows between 52° and 66°. The average high for August is 84° with an average low of 61°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Dedham. See also: September | October | November.
