S
M
T
W
T
F
S
26
62°
43°
27
62°
42°
28
63°
45°
29
62°
44°
30
63°
43°
1
65°
46°
2
64°
44°
3
63°
45°
4
63°
44°
5
64°
41°
6
65°
51°
7
73°
51°
8
68°
46°
9
65°
50°
10
66°
45°
11
66°
44°
12
64°
42°
13
64°
43°
14
65°
47°
15
66°
48°
16
67°
47°
17
69°
55°
18
73°
46°
19
67°
46°
20
68°
47°
21
70°
56°
22
75°
57°
23
75°
58°
24
78°
58°
25
76°
57°
26
80°
59°
27
80°
57°
28
74°
51°
29
82°
57°
30
82°
54°
31
79°
53°
1
78°
52°
2
76°
53°
3
77°
59°
4
80°
59°
5
75°
58°
6
75°
60°
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 62° to 82°, with overnight lows between 41° and 60°. The average high for May is 70° with an average low of 50°. 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.
