S
M
T
W
T
F
S
26
84°
68°
27
84°
61°
28
82°
61°
29
84°
63°
30
86°
65°
31
84°
62°
1
86°
68°
2
88°
64°
3
86°
63°
4
81°
61°
5
82°
63°
6
83°
65°
7
83°
62°
8
84°
61°
9
84°
66°
10
88°
67°
11
86°
67°
12
85°
66°
13
85°
67°
14
84°
67°
15
88°
65°
16
88°
61°
17
82°
60°
18
84°
66°
19
87°
60°
20
82°
59°
21
81°
60°
22
82°
62°
23
87°
63°
24
88°
65°
25
87°
64°
26
86°
60°
27
82°
58°
28
80°
59°
29
81°
61°
30
81°
60°
31
82°
63°
1
86°
63°
2
86°
62°
3
82°
63°
4
85°
62°
5
81°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Hillsboro
Hillsboro's August 2026 forecast shows daily high temperatures ranging from 80° to 88°, with overnight lows between 58° and 68°. The average high for August is 84° with an average low of 63°. 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 Hillsboro. See also: September | October | November.
