S
M
T
W
T
F
S
26
57°
27°
27
50°
36°
28
51°
31°
29
52°
28°
30
51°
29°
1
55°
36°
2
65°
34°
3
71°
45°
4
54°
31°
5
46°
30°
6
49°
33°
7
56°
38°
8
65°
40°
9
63°
41°
10
62°
43°
11
64°
43°
12
63°
45°
13
68°
44°
14
67°
45°
15
60°
40°
16
62°
48°
17
62°
49°
18
71°
50°
19
69°
48°
20
65°
46°
21
64°
44°
22
63°
43°
23
61°
42°
24
64°
44°
25
65°
46°
26
66°
51°
27
64°
51°
28
65°
46°
29
71°
49°
30
66°
46°
31
66°
53°
1
67°
52°
2
67°
53°
3
66°
57°
4
69°
56°
5
68°
56°
6
69°
57°
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 46° to 71°, with overnight lows between 30° and 57°. The average high for May is 64° with an average low of 45°. 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.
