S
M
T
W
T
F
S
26
83°
71°
27
85°
72°
28
88°
72°
29
86°
71°
30
88°
72°
31
87°
72°
1
88°
71°
2
86°
72°
3
87°
72°
4
89°
71°
5
87°
71°
6
84°
70°
7
87°
71°
8
87°
68°
9
81°
65°
10
80°
64°
11
81°
67°
12
81°
70°
13
82°
70°
14
84°
69°
15
86°
70°
16
82°
69°
17
86°
62°
18
81°
62°
19
82°
67°
20
85°
68°
21
86°
69°
22
85°
68°
23
87°
69°
24
85°
67°
25
84°
66°
26
78°
64°
27
78°
62°
28
79°
62°
29
78°
63°
30
79°
63°
31
82°
67°
1
84°
67°
2
85°
66°
3
85°
62°
4
83°
58°
5
77°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Dorchester
Dorchester's August 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 58° and 72°. The average high for August is 84° with an average low of 67°. 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 Dorchester. See also: September | October | November.
