S
M
T
W
T
F
S
26
84°
70°
27
84°
69°
28
83°
71°
29
80°
70°
30
79°
70°
31
83°
69°
1
84°
71°
2
84°
69°
3
86°
69°
4
86°
70°
5
83°
69°
6
84°
68°
7
78°
69°
8
80°
65°
9
79°
64°
10
80°
63°
11
79°
68°
12
81°
69°
13
84°
69°
14
84°
63°
15
81°
62°
16
78°
63°
17
79°
67°
18
77°
62°
19
80°
62°
20
78°
63°
21
78°
62°
22
80°
65°
23
82°
62°
24
81°
61°
25
79°
61°
26
78°
64°
27
76°
62°
28
75°
64°
29
81°
68°
30
82°
66°
31
81°
59°
1
79°
58°
2
74°
59°
3
73°
59°
4
74°
58°
5
73°
58°
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 73° to 86°, with overnight lows between 58° and 71°. The average high for August is 80° with an average low of 65°. 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.
