S
M
T
W
T
F
S
26
86°
73°
27
91°
74°
28
85°
68°
29
72°
59°
30
64°
59°
1
63°
51°
2
75°
46°
3
81°
58°
4
83°
68°
5
88°
67°
6
82°
54°
7
72°
57°
8
78°
62°
9
81°
64°
10
80°
64°
11
78°
57°
12
81°
58°
13
87°
63°
14
89°
64°
15
86°
67°
16
84°
62°
17
79°
66°
18
79°
66°
19
81°
65°
20
83°
66°
21
85°
60°
22
80°
59°
23
80°
61°
24
82°
63°
25
82°
61°
26
80°
60°
27
81°
61°
28
82°
62°
29
81°
66°
30
80°
67°
31
82°
68°
1
84°
67°
2
85°
66°
3
86°
71°
4
86°
71°
5
85°
70°
6
83°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Hillsboro
Hillsboro's May 2026 forecast shows daily high temperatures ranging from 72° to 89°, with overnight lows between 54° and 71°. The average high for May is 82° with an average low of 64°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Hillsboro. See also: June | July | August.
