S
M
T
W
T
F
S
26
83°
66°
27
83°
66°
28
79°
65°
29
79°
65°
30
82°
66°
31
85°
67°
1
84°
66°
2
82°
64°
3
86°
66°
4
86°
65°
5
79°
61°
6
83°
62°
7
79°
59°
8
78°
60°
9
77°
58°
10
79°
58°
11
82°
64°
12
86°
65°
13
83°
63°
14
85°
57°
15
79°
59°
16
81°
65°
17
83°
60°
18
79°
58°
19
79°
58°
20
81°
59°
21
82°
62°
22
86°
63°
23
85°
63°
24
85°
64°
25
86°
62°
26
85°
63°
27
84°
61°
28
83°
63°
29
84°
63°
30
83°
58°
31
78°
54°
1
77°
54°
2
76°
55°
3
76°
55°
4
77°
56°
5
75°
55°
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 75° to 86°, with overnight lows between 54° and 67°. The average high for August is 82° 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 Hillsboro. See also: September | October | November.
