S
M
T
W
T
F
S
26
72°
60°
27
77°
59°
28
85°
65°
29
69°
65°
30
73°
63°
31
75°
66°
1
85°
69°
2
86°
71°
3
80°
71°
4
87°
66°
5
88°
67°
6
86°
73°
7
94°
76°
8
92°
74°
9
90°
74°
10
85°
71°
11
89°
74°
12
84°
70°
13
86°
70°
14
82°
60°
15
79°
59°
16
80°
65°
17
73°
64°
18
79°
63°
19
83°
70°
20
76°
62°
21
76°
64°
22
77°
65°
23
76°
63°
24
78°
63°
25
75°
62°
26
74°
65°
27
73°
64°
28
74°
61°
29
74°
61°
30
77°
67°
31
77°
67°
1
74°
66°
2
78°
67°
3
80°
67°
4
78°
66°
5
76°
66°
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 73° to 83°, with overnight lows between 59° and 70°. The average high for August is 77° with an average low of 64°. 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.
