S
M
T
W
T
F
S
26
79°
63°
27
80°
62°
28
80°
64°
29
81°
62°
30
80°
63°
31
80°
69°
1
84°
69°
2
85°
68°
3
85°
70°
4
84°
69°
5
85°
61°
6
81°
62°
7
77°
62°
8
78°
63°
9
79°
64°
10
80°
65°
11
82°
68°
12
83°
63°
13
81°
68°
14
84°
67°
15
83°
69°
16
83°
68°
17
84°
65°
18
80°
62°
19
76°
62°
20
77°
63°
21
77°
64°
22
78°
67°
23
76°
64°
24
78°
65°
25
79°
68°
26
82°
66°
27
82°
61°
28
80°
64°
29
76°
65°
30
80°
66°
31
81°
67°
1
82°
66°
2
82°
65°
3
80°
60°
4
81°
57°
5
73°
59°
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 85°, with overnight lows between 57° and 70°. The average high for August is 80° with an average low of 65°. 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.
