S
M
T
W
T
F
S
26
54°
40°
27
68°
37°
28
57°
50°
29
54°
50°
30
54°
40°
1
55°
33°
2
48°
34°
3
59°
36°
4
75°
42°
5
77°
54°
6
65°
48°
7
59°
41°
8
59°
37°
9
61°
46°
10
64°
48°
11
61°
39°
12
68°
34°
13
64°
47°
14
48°
44°
15
68°
46°
16
75°
46°
17
86°
63°
18
90°
60°
19
84°
64°
20
79°
57°
21
61°
51°
22
63°
46°
23
49°
46°
24
59°
49°
25
75°
55°
26
77°
54°
27
84°
64°
28
72°
51°
29
77°
46°
30
66°
48°
31
74°
48°
1
74°
49°
2
72°
47°
3
79°
51°
4
82°
57°
5
83°
61°
6
83°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Lemont
Lemont's May 2026 forecast shows daily high temperatures ranging from 72° to 83°, with overnight lows between 47° and 61°. The average high for May is 78° 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 Lemont. See also: June | July | August.
