S
M
T
W
T
F
S
26
82°
64°
27
86°
67°
28
86°
68°
29
80°
67°
30
86°
64°
31
81°
61°
1
79°
61°
2
80°
63°
3
80°
65°
4
85°
67°
5
86°
67°
6
86°
65°
7
83°
65°
8
85°
66°
9
85°
66°
10
84°
59°
11
81°
58°
12
82°
60°
13
79°
59°
14
81°
60°
15
79°
62°
16
79°
64°
17
78°
63°
18
78°
60°
19
79°
58°
20
78°
59°
21
78°
61°
22
80°
64°
23
80°
64°
24
83°
63°
25
83°
57°
26
82°
56°
27
77°
57°
28
76°
58°
29
75°
60°
30
77°
61°
31
76°
62°
1
81°
58°
2
76°
58°
3
77°
56°
4
75°
55°
5
74°
55°
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 74° to 86°, with overnight lows between 55° and 68°. The average high for August is 80° with an average low of 62°. 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.
