S
M
T
W
T
F
S
26
72°
52°
27
72°
53°
28
71°
50°
29
72°
53°
30
74°
59°
31
78°
61°
1
81°
61°
2
82°
59°
3
81°
55°
4
74°
52°
5
72°
50°
6
71°
51°
7
72°
55°
8
76°
57°
9
77°
58°
10
76°
60°
11
77°
59°
12
78°
58°
13
79°
59°
14
78°
58°
15
79°
53°
16
74°
50°
17
72°
53°
18
74°
58°
19
76°
57°
20
77°
52°
21
73°
54°
22
74°
54°
23
75°
58°
24
77°
53°
25
74°
54°
26
73°
50°
27
72°
52°
28
70°
55°
29
68°
56°
30
78°
50°
31
70°
49°
1
68°
50°
2
67°
48°
3
66°
53°
4
67°
55°
5
73°
56°
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 82°, with overnight lows between 48° and 61°. The average high for August is 74° with an average low of 55°. 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.
