S
M
T
W
T
F
S
26
97°
74°
27
97°
78°
28
91°
75°
29
87°
68°
30
89°
65°
31
79°
69°
1
76°
69°
2
82°
64°
3
85°
64°
4
86°
65°
5
91°
70°
6
88°
70°
7
87°
69°
8
89°
71°
9
94°
70°
10
96°
73°
11
89°
70°
12
92°
68°
13
89°
70°
14
91°
68°
15
88°
67°
16
83°
65°
17
93°
72°
18
93°
71°
19
92°
72°
20
92°
70°
21
90°
69°
22
91°
71°
23
91°
70°
24
89°
69°
25
89°
69°
26
88°
68°
27
88°
68°
28
89°
67°
29
90°
68°
30
88°
67°
31
88°
67°
1
89°
66°
2
89°
67°
3
88°
66°
4
87°
65°
5
88°
66°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in East St. Louis
East St. Louis's August 2026 forecast shows daily high temperatures ranging from 82° to 96°, with overnight lows between 64° and 73°. The average high for August is 89° with an average low of 68°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in East St. Louis. See also: September | October | November.
