S
M
T
W
T
F
S
26
81°
55°
27
81°
55°
28
82°
56°
29
82°
56°
30
81°
55°
31
74°
50°
1
73°
48°
2
78°
52°
3
81°
54°
4
81°
54°
5
82°
55°
6
81°
54°
7
78°
48°
8
82°
50°
9
78°
48°
10
80°
52°
11
82°
56°
12
83°
55°
13
78°
55°
14
77°
48°
15
77°
47°
16
78°
46°
17
74°
52°
18
74°
48°
19
75°
45°
20
73°
48°
21
73°
48°
22
74°
50°
23
80°
52°
24
76°
52°
25
71°
45°
26
72°
51°
27
75°
53°
28
81°
46°
29
80°
46°
30
79°
50°
31
80°
54°
1
81°
53°
2
81°
54°
3
80°
47°
4
79°
48°
5
78°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Boston Harbor
Boston Harbor's August 2026 forecast shows daily high temperatures ranging from 71° to 83°, with overnight lows between 45° and 56°. The average high for August is 78° with an average low of 51°. 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 Harbor. See also: September | October | November.
