S
M
T
W
T
F
S
26
55°
45°
27
72°
41°
28
63°
50°
29
59°
55°
30
66°
45°
1
68°
37°
2
59°
43°
3
63°
37°
4
79°
45°
5
84°
55°
6
72°
55°
7
66°
46°
8
73°
43°
9
75°
55°
10
81°
50°
11
63°
46°
12
72°
41°
13
75°
54°
14
63°
50°
15
72°
50°
16
84°
46°
17
88°
59°
18
95°
63°
19
97°
70°
20
95°
68°
21
68°
52°
22
57°
48°
23
54°
50°
24
63°
50°
25
75°
61°
26
72°
64°
27
80°
64°
28
77°
50°
29
78°
58°
30
73°
49°
31
71°
52°
1
72°
52°
2
74°
52°
3
74°
56°
4
77°
60°
5
75°
59°
6
79°
59°
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 71° to 80°, with overnight lows between 49° and 64°. The average high for May is 75° with an average low of 56°. 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.
