S
M
T
W
T
F
S
26
90°
72°
27
87°
63°
28
86°
64°
29
88°
67°
30
92°
68°
31
90°
72°
1
93°
65°
2
89°
65°
3
87°
66°
4
84°
63°
5
85°
64°
6
85°
64°
7
86°
65°
8
86°
67°
9
87°
69°
10
86°
67°
11
88°
70°
12
88°
70°
13
92°
69°
14
93°
64°
15
92°
67°
16
87°
68°
17
88°
69°
18
90°
66°
19
91°
64°
20
89°
63°
21
89°
63°
22
88°
64°
23
90°
65°
24
89°
67°
25
91°
65°
26
91°
67°
27
90°
67°
28
90°
66°
29
85°
67°
30
87°
66°
31
88°
66°
1
86°
64°
2
88°
65°
3
85°
64°
4
87°
58°
5
79°
57°
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 79° to 93°, with overnight lows between 57° and 72°. The average high for August is 88° 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.
