S
M
T
W
T
F
S
26
77°
64°
27
85°
62°
28
83°
67°
29
79°
60°
30
83°
56°
31
83°
60°
1
78°
68°
2
79°
66°
3
80°
60°
4
83°
56°
5
86°
64°
6
86°
65°
7
84°
67°
8
88°
69°
9
88°
66°
10
89°
71°
11
79°
65°
12
69°
63°
13
86°
63°
14
84°
70°
15
81°
70°
16
89°
71°
17
86°
70°
18
82°
63°
19
78°
61°
20
80°
65°
21
83°
62°
22
83°
64°
23
79°
59°
24
77°
52°
25
78°
52°
26
83°
63°
27
83°
61°
28
82°
57°
29
84°
59°
30
91°
67°
31
89°
65°
1
91°
67°
2
89°
67°
3
88°
66°
4
81°
57°
5
79°
56°
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 79° to 91°, with overnight lows between 56° and 67°. The average high for August is 85° with an average low of 62°. 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.
