S
M
T
W
T
F
S
26
85°
66°
27
85°
67°
28
86°
66°
29
86°
67°
30
87°
66°
31
86°
67°
1
89°
72°
2
90°
71°
3
91°
71°
4
91°
70°
5
90°
69°
6
89°
65°
7
84°
64°
8
85°
66°
9
85°
65°
10
86°
66°
11
87°
66°
12
86°
69°
13
89°
69°
14
90°
70°
15
90°
69°
16
89°
70°
17
90°
70°
18
89°
69°
19
89°
68°
20
84°
69°
21
86°
69°
22
87°
68°
23
86°
66°
24
88°
66°
25
86°
69°
26
88°
67°
27
89°
67°
28
86°
69°
29
87°
69°
30
88°
68°
31
88°
68°
1
87°
67°
2
87°
66°
3
86°
67°
4
87°
67°
5
86°
67°
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 84° to 91°, with overnight lows between 64° and 72°. The average high for August is 87° with an average low of 68°. 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.
