S
M
T
W
T
F
S
26
79°
46°
27
85°
47°
28
84°
63°
29
71°
65°
30
76°
62°
31
82°
58°
1
86°
66°
2
84°
69°
3
80°
66°
4
84°
65°
5
82°
70°
6
85°
68°
7
84°
67°
8
87°
65°
9
85°
63°
10
84°
63°
11
82°
61°
12
80°
61°
13
78°
58°
14
77°
60°
15
78°
58°
16
76°
57°
17
77°
60°
18
77°
58°
19
78°
62°
20
77°
59°
21
76°
56°
22
76°
61°
23
81°
63°
24
82°
63°
25
81°
61°
26
77°
60°
27
75°
60°
28
74°
62°
29
78°
60°
30
81°
61°
31
79°
60°
1
80°
55°
2
73°
53°
3
72°
55°
4
72°
53°
5
73°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Southborough
Southborough's August 2026 forecast shows daily high temperatures ranging from 72° to 87°, with overnight lows between 52° and 70°. The average high for August is 79° with an average low of 61°. 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 Southborough. See also: September | October | November.
