S
M
T
W
T
F
S
26
88°
72°
27
86°
71°
28
88°
72°
29
88°
73°
30
89°
73°
31
89°
72°
1
92°
72°
2
91°
73°
3
90°
73°
4
91°
72°
5
89°
73°
6
88°
73°
7
88°
72°
8
90°
73°
9
90°
73°
10
88°
72°
11
87°
73°
12
88°
73°
13
90°
72°
14
91°
73°
15
91°
73°
16
90°
72°
17
93°
73°
18
94°
73°
19
93°
71°
20
92°
70°
21
93°
69°
22
92°
70°
23
93°
70°
24
92°
69°
25
91°
68°
26
90°
70°
27
91°
68°
28
88°
69°
29
90°
70°
30
90°
68°
31
89°
67°
1
91°
67°
2
90°
68°
3
90°
70°
4
91°
70°
5
92°
68°
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 86° to 94°, with overnight lows between 67° and 73°. The average high for August is 90° with an average low of 71°. 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.
