S
M
T
W
T
F
S
26
82°
53°
27
81°
56°
28
75°
60°
29
77°
59°
30
65°
51°
1
69°
44°
2
66°
43°
3
69°
37°
4
79°
45°
5
74°
50°
6
71°
53°
7
67°
46°
8
73°
40°
9
76°
50°
10
84°
52°
11
72°
48°
12
77°
45°
13
81°
54°
14
71°
46°
15
82°
41°
16
85°
60°
17
89°
59°
18
87°
64°
19
88°
67°
20
87°
62°
21
76°
65°
22
75°
65°
23
82°
65°
24
74°
66°
25
82°
64°
26
82°
67°
27
86°
66°
28
84°
64°
29
83°
68°
30
77°
65°
31
79°
64°
1
81°
58°
2
76°
54°
3
80°
61°
4
77°
62°
5
78°
60°
6
80°
63°
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 76° to 84°, with overnight lows between 54° and 68°. The average high for May is 80° 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.
