S
M
T
W
T
F
S
26
84°
59°
27
75°
59°
28
66°
55°
29
84°
61°
30
75°
57°
1
66°
57°
2
73°
48°
3
72°
45°
4
79°
43°
5
81°
50°
6
84°
64°
7
75°
55°
8
73°
54°
9
72°
57°
10
84°
59°
11
82°
59°
12
73°
55°
13
82°
54°
14
77°
54°
15
79°
48°
16
84°
52°
17
91°
66°
18
90°
63°
19
90°
63°
20
91°
68°
21
90°
70°
22
90°
68°
23
84°
70°
24
84°
70°
25
86°
68°
26
84°
67°
27
82°
68°
28
84°
70°
29
79°
68°
30
79°
66°
31
78°
58°
1
78°
57°
2
79°
58°
3
78°
57°
4
77°
58°
5
82°
61°
6
82°
63°
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 77° to 84°, with overnight lows between 57° and 70°. The average high for May is 80° with an average low of 63°. 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.
