S
M
T
W
T
F
S
26
82°
60°
27
83°
61°
28
82°
60°
29
81°
59°
30
77°
56°
31
78°
61°
1
77°
57°
2
80°
61°
3
80°
62°
4
82°
61°
5
77°
57°
6
77°
59°
7
76°
56°
8
76°
57°
9
77°
59°
10
76°
56°
11
75°
55°
12
75°
57°
13
80°
64°
14
83°
62°
15
80°
59°
16
76°
56°
17
77°
62°
18
75°
61°
19
75°
59°
20
76°
57°
21
75°
61°
22
75°
61°
23
76°
60°
24
75°
61°
25
75°
58°
26
77°
61°
27
77°
60°
28
79°
58°
29
75°
55°
30
76°
54°
31
79°
55°
1
81°
57°
2
80°
58°
3
81°
59°
4
80°
52°
5
76°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Louis
St. Louis's August 2026 forecast shows daily high temperatures ranging from 75° to 83°, with overnight lows between 51° and 64°. The average high for August is 78° with an average low of 58°. 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 St. Louis. See also: September | October | November.
