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
59°
44°
14
68°
52°
15
73°
61°
16
82°
60°
17
70°
66°
18
86°
56°
19
71°
51°
20
62°
48°
21
63°
51°
22
69°
50°
23
70°
55°
24
72°
58°
25
76°
62°
26
86°
64°
27
70°
60°
28
76°
59°
29
74°
59°
30
69°
56°
31
69°
53°
1
70°
51°
2
69°
51°
3
70°
53°
4
73°
61°
5
80°
63°
6
81°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in O'Hare
O'Hare's May 2026 forecast shows daily high temperatures ranging from 59° to 86°, with overnight lows between 44° and 66°. The average high for May is 72° with an average low of 56°. 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 O'Hare. See also: June | July | August.
