S
M
T
W
T
F
S
26
77°
45°
27
73°
52°
28
63°
48°
29
57°
37°
30
57°
34°
1
57°
34°
2
59°
37°
3
72°
41°
4
82°
45°
5
55°
45°
6
55°
37°
7
66°
34°
8
70°
41°
9
77°
46°
10
68°
43°
11
72°
45°
12
81°
50°
13
72°
50°
14
77°
45°
15
82°
54°
16
81°
59°
17
82°
63°
18
73°
63°
19
68°
48°
20
64°
45°
21
68°
51°
22
68°
56°
23
74°
54°
24
78°
55°
25
82°
61°
26
83°
62°
27
83°
61°
28
82°
60°
29
81°
59°
30
81°
60°
31
82°
60°
1
81°
59°
2
80°
59°
3
79°
56°
4
80°
60°
5
75°
57°
6
76°
61°
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 83°, with overnight lows between 51° and 62°. The average high for May is 78° with an average low of 58°. 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.
