S
M
T
W
T
F
S
26
70°
56°
27
71°
57°
28
72°
56°
29
73°
57°
30
72°
56°
31
71°
56°
1
71°
57°
2
72°
57°
3
72°
56°
4
71°
57°
5
71°
57°
6
70°
56°
7
71°
58°
8
71°
58°
9
70°
56°
10
71°
55°
11
71°
58°
12
72°
57°
13
69°
54°
14
70°
53°
15
69°
54°
16
69°
58°
17
70°
57°
18
71°
54°
19
68°
53°
20
68°
57°
21
68°
54°
22
69°
54°
23
68°
52°
24
66°
57°
25
69°
56°
26
67°
51°
27
66°
50°
28
65°
49°
29
65°
55°
30
70°
57°
31
Hist. Avg.
67°
52°
1
Hist. Avg.
67°
51°
2
Hist. Avg.
67°
51°
3
Hist. Avg.
67°
51°
4
Hist. Avg.
67°
51°
5
Hist. Avg.
66°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Dorchester
Dorchester's August 2026 forecast shows daily high temperatures ranging from 65° to 73°, with overnight lows between 49° and 58°. The average high for August is 70° with an average low of 55°. 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.
