S
M
T
W
T
F
S
26
85°
71°
27
85°
71°
28
84°
70°
29
84°
71°
30
82°
69°
31
78°
67°
1
78°
65°
2
77°
64°
3
78°
67°
4
78°
66°
5
79°
65°
6
78°
66°
7
79°
69°
8
78°
68°
9
79°
69°
10
82°
63°
11
80°
64°
12
83°
67°
13
80°
68°
14
82°
69°
15
84°
68°
16
84°
68°
17
85°
69°
18
85°
69°
19
83°
65°
20
81°
62°
21
77°
62°
22
77°
61°
23
78°
59°
24
76°
61°
25
78°
61°
26
82°
60°
27
82°
61°
28
79°
65°
29
78°
64°
30
77°
62°
31
81°
66°
1
80°
58°
2
81°
59°
3
74°
58°
4
75°
60°
5
76°
66°
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 85°, 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.
