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
84°
69°
15
76°
66°
16
81°
62°
17
76°
66°
18
76°
66°
19
89°
68°
20
85°
65°
21
71°
66°
22
71°
65°
23
71°
65°
24
85°
65°
25
81°
65°
26
78°
65°
27
82°
70°
28
81°
65°
29
76°
62°
30
84°
65°
31
82°
70°
1
78°
68°
2
80°
68°
3
74°
66°
4
76°
66°
5
75°
63°
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 74° to 84°, with overnight lows between 62° and 70°. The average high for August is 79° with an average low of 66°. 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.
