S
M
T
W
T
F
S
26
69°
55°
27
72°
49°
28
63°
42°
29
63°
39°
30
65°
42°
1
70°
38°
2
70°
43°
3
87°
46°
4
87°
59°
5
59°
45°
6
62°
44°
7
77°
42°
8
76°
54°
9
88°
52°
10
72°
52°
11
81°
48°
12
90°
55°
13
81°
58°
14
89°
67°
15
91°
65°
16
89°
69°
17
89°
71°
18
92°
50°
19
68°
52°
20
71°
53°
21
68°
54°
22
73°
57°
23
84°
61°
24
82°
63°
25
79°
61°
26
78°
63°
27
80°
59°
28
85°
63°
29
84°
62°
30
84°
63°
31
82°
64°
1
77°
59°
2
77°
64°
3
84°
66°
4
87°
67°
5
87°
67°
6
86°
66°
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 68° to 92°, with overnight lows between 50° and 71°. The average high for May is 82° 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 May weather will actually feel in Hillsboro. See also: June | July | August.
