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
91°
68°
10
91°
72°
11
86°
68°
12
85°
67°
13
83°
63°
14
80°
62°
15
78°
62°
16
75°
63°
17
76°
62°
18
76°
64°
19
77°
65°
20
77°
66°
21
76°
67°
22
77°
65°
23
80°
69°
24
74°
63°
25
75°
66°
26
78°
67°
27
81°
68°
28
82°
67°
29
78°
62°
30
74°
60°
31
73°
60°
1
73°
61°
2
74°
64°
3
73°
62°
4
73°
64°
5
74°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Downtown Boston
Downtown Boston's August 2026 forecast shows daily high temperatures ranging from 73° to 91°, with overnight lows between 60° and 72°. The average high for August is 78° 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 Downtown Boston. See also: September | October | November.
