S
M
T
W
T
F
S
26
88°
69°
27
89°
69°
28
89°
69°
29
90°
70°
30
89°
68°
31
88°
69°
1
89°
70°
2
89°
70°
3
92°
72°
4
93°
71°
5
91°
70°
6
90°
71°
7
90°
68°
8
91°
69°
9
93°
69°
10
90°
71°
11
92°
71°
12
91°
72°
13
89°
71°
14
88°
71°
15
88°
70°
16
89°
71°
17
93°
71°
18
92°
70°
19
88°
70°
20
88°
68°
21
89°
69°
22
92°
71°
23
90°
69°
24
88°
70°
25
87°
67°
26
88°
68°
27
91°
70°
28
91°
66°
29
88°
66°
30
86°
67°
31
86°
66°
1
87°
66°
2
88°
67°
3
89°
66°
4
89°
69°
5
88°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Saint Louis
Saint Louis's August 2026 forecast shows daily high temperatures ranging from 86° to 93°, with overnight lows between 66° and 72°. The average high for August is 89° with an average low of 69°. 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 Saint Louis. See also: September | October | November.
