S
M
T
W
T
F
S
26
59°
42°
27
68°
47°
28
64°
50°
29
57°
40°
30
56°
37°
1
50°
35°
2
57°
32°
3
68°
45°
4
80°
51°
5
61°
46°
6
58°
41°
7
60°
37°
8
67°
38°
9
75°
48°
10
65°
40°
11
56°
42°
12
72°
41°
13
60°
44°
14
66°
52°
15
75°
59°
16
80°
64°
17
80°
70°
18
78°
59°
19
69°
48°
20
59°
45°
21
62°
48°
22
68°
50°
23
68°
50°
24
70°
55°
25
72°
58°
26
72°
51°
27
69°
57°
28
74°
56°
29
72°
56°
30
68°
53°
31
68°
50°
1
69°
48°
2
67°
48°
3
68°
50°
4
71°
59°
5
79°
60°
6
79°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oak Brook
Oak Brook's May 2026 forecast shows daily high temperatures ranging from 59° to 80°, with overnight lows between 44° and 70°. The average high for May is 71° with an average low of 54°. 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 Oak Brook. See also: June | July | August.
