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