S
M
T
W
T
F
S
26
65°
44°
27
66°
51°
28
62°
49°
29
58°
38°
30
59°
35°
1
51°
36°
2
56°
41°
3
63°
47°
4
75°
51°
5
57°
44°
6
55°
40°
7
55°
39°
8
64°
48°
9
65°
46°
10
64°
47°
11
64°
49°
12
68°
50°
13
64°
47°
14
71°
49°
15
64°
47°
16
64°
46°
17
66°
55°
18
73°
55°
19
67°
54°
20
71°
56°
21
74°
56°
22
71°
55°
23
75°
52°
24
67°
50°
25
67°
53°
26
69°
58°
27
73°
56°
28
69°
55°
29
70°
51°
30
72°
50°
31
71°
51°
1
70°
56°
2
80°
56°
3
70°
54°
4
71°
52°
5
71°
52°
6
72°
53°
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 51° to 80°, with overnight lows between 36° and 58°. 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 Lemont. See also: June | July | August.
