S
M
T
W
T
F
S
26
64°
44°
27
65°
49°
28
65°
46°
29
68°
50°
30
65°
47°
1
68°
54°
2
67°
57°
3
77°
52°
4
67°
47°
5
65°
46°
6
66°
48°
7
72°
55°
8
72°
51°
9
69°
50°
10
68°
49°
11
68°
50°
12
74°
60°
13
80°
62°
14
79°
60°
15
76°
53°
16
70°
52°
17
71°
59°
18
80°
63°
19
81°
63°
20
77°
59°
21
73°
55°
22
75°
59°
23
77°
58°
24
77°
59°
25
80°
62°
26
81°
63°
27
83°
63°
28
84°
64°
29
87°
61°
30
83°
62°
31
84°
57°
1
82°
56°
2
78°
57°
3
78°
56°
4
79°
59°
5
79°
59°
6
78°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in East St. Louis
East St. Louis's May 2026 forecast shows daily high temperatures ranging from 64° to 87°, with overnight lows between 44° and 66°. The average high for May is 75° 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 East St. Louis. See also: June | July | August.
