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
95°
72°
25
91°
72°
26
86°
72°
27
91°
75°
28
86°
72°
29
82°
72°
30
91°
72°
31
93°
73°
1
91°
74°
2
90°
73°
3
93°
74°
4
92°
71°
5
94°
70°
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 90° to 94°, with overnight lows between 70° and 74°. The average high for August is 92° with an average low of 72°. 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.
