S
M
T
W
T
F
S
26
82°
60°
27
77°
59°
28
79°
59°
29
77°
56°
30
77°
56°
31
80°
60°
1
83°
64°
2
78°
64°
3
84°
63°
4
84°
61°
5
78°
57°
6
78°
63°
7
84°
63°
8
80°
61°
9
83°
62°
10
78°
59°
11
80°
60°
12
83°
62°
13
82°
60°
14
77°
55°
15
75°
54°
16
76°
57°
17
78°
59°
18
82°
62°
19
79°
61°
20
83°
62°
21
83°
60°
22
75°
56°
23
80°
57°
24
76°
59°
25
80°
60°
26
83°
55°
27
78°
51°
28
74°
50°
29
71°
51°
30
74°
51°
31
74°
58°
1
75°
59°
2
80°
60°
3
75°
51°
4
75°
49°
5
72°
50°
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 71° to 84°, with overnight lows between 49° and 64°. The average high for August is 79° 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.
