S
M
T
W
T
F
S
26
89°
75°
27
90°
74°
28
90°
75°
29
93°
73°
30
89°
74°
31
89°
74°
1
90°
73°
2
91°
74°
3
89°
74°
4
91°
73°
5
90°
74°
6
92°
74°
7
88°
73°
8
89°
74°
9
90°
74°
10
88°
73°
11
87°
73°
12
88°
72°
13
87°
73°
14
92°
72°
15
93°
73°
16
92°
72°
17
93°
71°
18
92°
72°
19
91°
73°
20
93°
70°
21
93°
70°
22
91°
69°
23
88°
69°
24
88°
67°
25
89°
68°
26
91°
68°
27
91°
69°
28
93°
70°
29
94°
70°
30
93°
71°
31
92°
71°
1
92°
70°
2
91°
71°
3
91°
71°
4
89°
67°
5
90°
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 87° to 94°, with overnight lows between 67° and 75°. The average high for August is 91° 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.
