S
M
T
W
T
F
S
26
80°
62°
27
80°
61°
28
75°
61°
29
75°
60°
30
77°
62°
31
81°
63°
1
81°
62°
2
78°
62°
3
83°
61°
4
83°
54°
5
76°
54°
6
79°
56°
7
78°
55°
8
73°
54°
9
73°
54°
10
74°
56°
11
76°
61°
12
80°
60°
13
78°
53°
14
75°
53°
15
74°
52°
16
75°
57°
17
74°
55°
18
74°
52°
19
75°
52°
20
75°
53°
21
76°
54°
22
78°
59°
23
80°
60°
24
81°
60°
25
80°
58°
26
81°
59°
27
80°
54°
28
78°
59°
29
79°
57°
30
74°
51°
31
72°
48°
1
69°
50°
2
69°
48°
3
70°
48°
4
69°
49°
5
68°
49°
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 68° to 83°, with overnight lows between 48° and 63°. The average high for August is 76° with an average low of 56°. 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.
