S
M
T
W
T
F
S
26
73°
61°
27
75°
59°
28
88°
64°
29
90°
64°
30
75°
61°
31
73°
54°
1
75°
50°
2
75°
52°
3
79°
61°
4
86°
61°
5
77°
57°
6
68°
54°
7
75°
48°
8
82°
50°
9
84°
59°
10
75°
55°
11
76°
55°
12
85°
58°
13
91°
61°
14
79°
56°
15
71°
51°
16
70°
56°
17
70°
54°
18
71°
56°
19
72°
55°
20
71°
54°
21
73°
56°
22
71°
55°
23
72°
56°
24
71°
52°
25
71°
53°
26
69°
51°
27
67°
51°
28
67°
50°
29
68°
50°
30
69°
55°
31
66°
54°
1
67°
52°
2
70°
56°
3
71°
55°
4
70°
55°
5
70°
53°
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 66° to 91°, with overnight lows between 50° and 61°. The average high for August is 72° with an average low of 54°. 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.
