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
55°
41°
3
64°
46°
4
75°
50°
5
54°
41°
6
52°
39°
7
53°
39°
8
57°
44°
9
62°
47°
10
61°
45°
11
61°
47°
12
65°
49°
13
65°
52°
14
67°
48°
15
70°
49°
16
71°
56°
17
70°
53°
18
66°
52°
19
71°
56°
20
70°
55°
21
68°
46°
22
65°
46°
23
65°
47°
24
66°
47°
25
66°
48°
26
67°
48°
27
66°
49°
28
68°
49°
29
68°
54°
30
69°
59°
31
73°
54°
1
70°
55°
2
74°
59°
3
76°
60°
4
78°
60°
5
78°
61°
6
80°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Oak Forest
Oak Forest's May 2026 forecast shows daily high temperatures ranging from 52° to 80°, with overnight lows between 39° and 62°. The average high for May is 67° with an average low of 50°. 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 Forest. See also: June | July | August.
