S
M
T
W
T
F
S
26
74°
51°
27
77°
63°
28
77°
66°
29
68°
64°
30
71°
64°
31
75°
66°
1
80°
67°
2
82°
68°
3
80°
67°
4
81°
68°
5
82°
69°
6
83°
69°
7
84°
70°
8
83°
66°
9
79°
69°
10
79°
70°
11
82°
70°
12
78°
69°
13
80°
70°
14
81°
69°
15
79°
68°
16
77°
67°
17
77°
66°
18
78°
67°
19
79°
68°
20
78°
68°
21
77°
67°
22
76°
67°
23
77°
68°
24
80°
61°
25
75°
62°
26
75°
67°
27
76°
69°
28
81°
68°
29
81°
68°
30
80°
65°
31
75°
59°
1
73°
61°
2
73°
59°
3
72°
59°
4
72°
62°
5
73°
65°
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 68° to 84°, with overnight lows between 51° and 70°. The average high for August is 78° with an average low of 66°. 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.
