S
M
T
W
T
F
S
26
74°
43°
27
71°
45°
28
74°
48°
29
68°
50°
30
57°
38°
1
65°
30°
2
51°
37°
3
57°
31°
4
70°
48°
5
78°
53°
6
70°
53°
7
62°
37°
8
63°
42°
9
61°
41°
10
71°
51°
11
63°
44°
12
64°
46°
13
65°
46°
14
68°
48°
15
66°
43°
16
71°
46°
17
70°
45°
18
75°
50°
19
73°
49°
20
75°
51°
21
73°
50°
22
69°
43°
23
65°
42°
24
66°
43°
25
67°
47°
26
69°
45°
27
67°
44°
28
68°
45°
29
69°
45°
30
69°
51°
31
74°
54°
1
74°
54°
2
71°
53°
3
73°
52°
4
75°
52°
5
78°
54°
6
79°
56°
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 61° to 79°, with overnight lows between 37° and 56°. The average high for May is 70° with an average low of 48°. 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.
