S
M
T
W
T
F
S
26
72°
56°
27
81°
56°
28
81°
55°
29
79°
48°
30
80°
47°
31
75°
43°
1
71°
45°
2
74°
48°
3
76°
52°
4
79°
54°
5
81°
53°
6
81°
57°
7
80°
56°
8
82°
51°
9
81°
49°
10
77°
50°
11
70°
45°
12
69°
42°
13
67°
48°
14
70°
49°
15
75°
48°
16
77°
52°
17
78°
53°
18
79°
53°
19
79°
52°
20
77°
52°
21
77°
51°
22
78°
48°
23
72°
46°
24
67°
44°
25
68°
46°
26
68°
49°
27
66°
50°
28
66°
51°
29
71°
49°
30
66°
49°
31
66°
48°
1
72°
46°
2
73°
49°
3
73°
50°
4
74°
50°
5
75°
41°
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 66° to 82°, with overnight lows between 41° and 57°. The average high for August is 74° with an average low of 50°. 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.
