S
M
T
W
T
F
S
26
90°
73°
27
93°
77°
28
93°
72°
29
97°
77°
30
95°
73°
31
91°
72°
1
86°
73°
2
86°
75°
3
90°
73°
4
91°
73°
5
93°
72°
6
90°
72°
7
91°
70°
8
91°
72°
9
93°
73°
10
95°
72°
11
95°
73°
12
91°
72°
13
95°
72°
14
95°
72°
15
91°
72°
16
95°
75°
17
97°
77°
18
97°
77°
19
95°
73°
20
95°
72°
21
93°
72°
22
90°
72°
23
95°
73°
24
N/A
25
88°
72°
26
86°
73°
27
89°
72°
28
90°
72°
29
90°
69°
30
92°
71°
31
90°
69°
1
91°
70°
2
90°
69°
3
91°
68°
4
90°
69°
5
91°
68°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Boston
Boston's August 2026 forecast shows daily high temperatures ranging from 86° to 92°, with overnight lows between 68° and 73°. The average high for August is 90° with an average low of 70°. 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.
