S
M
T
W
T
F
S
26
88°
66°
27
85°
65°
28
82°
59°
29
83°
53°
30
91°
55°
31
86°
57°
1
73°
66°
2
79°
59°
3
82°
53°
4
85°
55°
5
77°
60°
6
79°
66°
7
86°
64°
8
86°
57°
9
78°
53°
10
86°
62°
11
82°
59°
12
84°
61°
13
80°
59°
14
85°
61°
15
81°
56°
16
89°
69°
17
83°
55°
18
85°
53°
19
80°
55°
20
82°
55°
21
81°
54°
22
80°
59°
23
75°
50°
24
79°
51°
25
81°
48°
26
79°
53°
27
83°
54°
28
79°
46°
29
83°
53°
30
82°
65°
31
82°
66°
1
91°
67°
2
90°
70°
3
79°
65°
4
81°
65°
5
80°
55°
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 ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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.
