S
M
T
W
T
F
S
26
68°
45°
27
64°
43°
28
64°
45°
29
72°
51°
30
72°
54°
1
71°
53°
2
68°
53°
3
67°
50°
4
65°
44°
5
66°
48°
6
75°
54°
7
74°
55°
8
74°
54°
9
71°
51°
10
67°
49°
11
68°
52°
12
68°
51°
13
69°
53°
14
74°
57°
15
75°
58°
16
76°
58°
17
74°
57°
18
75°
54°
19
70°
50°
20
70°
51°
21
75°
59°
22
74°
51°
23
74°
51°
24
75°
55°
25
78°
52°
26
72°
52°
27
73°
53°
28
76°
56°
29
82°
58°
30
82°
53°
31
79°
53°
1
75°
56°
2
76°
53°
3
76°
61°
4
82°
62°
5
84°
62°
6
85°
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 64° to 85°, with overnight lows between 43° and 62°. The average high for May is 73° with an average low of 53°. 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.
