S
M
T
W
T
F
S
26
60°
44°
27
68°
51°
28
64°
50°
29
57°
39°
30
56°
38°
1
50°
36°
2
56°
32°
3
67°
45°
4
80°
51°
5
61°
46°
6
56°
42°
7
58°
45°
8
62°
45°
9
71°
52°
10
58°
48°
11
59°
45°
12
62°
52°
13
69°
54°
14
65°
51°
15
70°
56°
16
71°
56°
17
73°
53°
18
67°
55°
19
72°
58°
20
72°
58°
21
70°
49°
22
66°
48°
23
66°
50°
24
68°
50°
25
68°
51°
26
69°
51°
27
68°
52°
28
69°
51°
29
70°
56°
30
71°
62°
31
75°
57°
1
72°
57°
2
75°
62°
3
78°
63°
4
80°
63°
5
80°
64°
6
82°
65°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oak Lawn
Oak Lawn's May 2026 forecast shows daily high temperatures ranging from 56° to 82°, with overnight lows between 42° and 65°. The average high for May is 69° with an average low of 53°. 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 Lawn. See also: June | July | August.
