S
M
T
W
T
F
S
26
84°
69°
27
84°
70°
28
85°
69°
29
85°
66°
30
84°
65°
31
79°
62°
1
79°
63°
2
81°
64°
3
80°
63°
4
79°
65°
5
81°
69°
6
82°
67°
7
81°
68°
8
84°
69°
9
81°
69°
10
82°
68°
11
80°
67°
12
84°
69°
13
85°
68°
14
84°
68°
15
84°
63°
16
83°
66°
17
78°
61°
18
80°
61°
19
79°
62°
20
78°
65°
21
79°
67°
22
83°
69°
23
83°
68°
24
84°
64°
25
83°
63°
26
83°
66°
27
77°
62°
28
75°
61°
29
Hist. Avg.
78°
63°
30
Hist. Avg.
78°
63°
31
Hist. Avg.
78°
63°
1
Hist. Avg.
78°
63°
2
Hist. Avg.
78°
62°
3
Hist. Avg.
77°
62°
4
Hist. Avg.
77°
62°
5
Hist. Avg.
77°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Downtown Boston
Downtown Boston's August 2026 forecast shows daily high temperatures ranging from 75° to 85°, with overnight lows between 61° and 70°. The average high for August is 82° 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 Downtown Boston. See also: September | October | November.
