S
M
T
W
T
F
S
26
92°
73°
27
88°
72°
28
91°
71°
29
86°
67°
30
84°
71°
31
85°
67°
1
87°
72°
2
93°
72°
3
92°
71°
4
92°
71°
5
91°
70°
6
92°
72°
7
91°
71°
8
92°
72°
9
93°
70°
10
84°
67°
11
87°
69°
12
88°
70°
13
88°
69°
14
83°
63°
15
82°
62°
16
82°
62°
17
83°
63°
18
83°
65°
19
84°
67°
20
86°
68°
21
85°
68°
22
86°
67°
23
86°
68°
24
89°
60°
25
86°
62°
26
85°
67°
27
84°
66°
28
85°
62°
29
84°
61°
30
81°
61°
31
81°
63°
1
83°
63°
2
81°
56°
3
80°
55°
4
78°
56°
5
78°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Caseyville
Caseyville's August 2026 forecast shows daily high temperatures ranging from 78° to 93°, with overnight lows between 55° and 73°. The average high for August is 86° with an average low of 66°. 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 Caseyville. See also: September | October | November.
