S
M
T
W
T
F
S
26
71°
37°
27
57°
40°
28
61°
45°
29
72°
44°
30
81°
49°
1
75°
46°
2
77°
51°
3
89°
52°
4
72°
51°
5
70°
48°
6
72°
47°
7
76°
46°
8
75°
47°
9
71°
48°
10
68°
49°
11
69°
48°
12
77°
51°
13
62°
45°
14
63°
41°
15
68°
44°
16
64°
46°
17
64°
44°
18
65°
44°
19
65°
46°
20
66°
44°
21
65°
48°
22
65°
43°
23
69°
44°
24
74°
49°
25
75°
50°
26
74°
48°
27
66°
46°
28
67°
45°
29
68°
49°
30
72°
51°
31
65°
48°
1
65°
47°
2
67°
45°
3
66°
46°
4
66°
43°
5
68°
45°
6
69°
47°
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 89°, with overnight lows between 41° and 52°. The average high for May is 70° with an average low of 47°. 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.
