S
M
T
W
T
F
S
26
76°
62°
27
81°
62°
28
79°
61°
29
80°
62°
30
78°
58°
31
73°
56°
1
74°
60°
2
78°
62°
3
81°
63°
4
82°
62°
5
80°
61°
6
78°
61°
7
79°
60°
8
81°
60°
9
81°
54°
10
74°
52°
11
73°
54°
12
75°
55°
13
74°
52°
14
74°
53°
15
75°
58°
16
75°
58°
17
78°
57°
18
75°
53°
19
75°
56°
20
78°
57°
21
79°
59°
22
80°
59°
23
78°
58°
24
80°
54°
25
77°
51°
26
74°
51°
27
73°
57°
28
76°
56°
29
76°
56°
30
77°
57°
31
74°
50°
1
73°
51°
2
73°
48°
3
71°
47°
4
72°
48°
5
74°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Boston
Boston's August 2026 forecast shows daily high temperatures ranging from 71° to 82°, with overnight lows between 47° and 63°. The average high for August is 77° 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 Boston. See also: September | October | November.
