S
M
T
W
T
F
S
26
91°
71°
27
93°
72°
28
94°
72°
29
93°
71°
30
93°
72°
31
92°
71°
1
93°
72°
2
94°
73°
3
94°
73°
4
93°
72°
5
94°
72°
6
94°
73°
7
95°
72°
8
92°
70°
9
91°
70°
10
91°
69°
11
93°
72°
12
94°
72°
13
94°
73°
14
93°
72°
15
93°
70°
16
92°
67°
17
91°
65°
18
86°
68°
19
91°
65°
20
90°
67°
21
92°
68°
22
90°
66°
23
85°
61°
24
84°
61°
25
83°
60°
26
84°
59°
27
84°
59°
28
85°
58°
29
84°
59°
30
84°
66°
31
88°
65°
1
85°
65°
2
90°
64°
3
90°
62°
4
89°
61°
5
82°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in O'Fallon Township
O'Fallon Township's August 2026 forecast shows daily high temperatures ranging from 82° to 95°, with overnight lows between 58° and 73°. The average high for August is 90° with an average low of 67°. 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 O'Fallon Township. See also: September | October | November.
