S
M
T
W
T
F
S
26
89°
69°
27
92°
72°
28
92°
74°
29
91°
75°
30
93°
74°
31
93°
75°
1
92°
75°
2
93°
74°
3
93°
69°
4
91°
68°
5
85°
67°
6
84°
66°
7
86°
67°
8
85°
67°
9
85°
68°
10
86°
66°
11
86°
69°
12
90°
73°
13
91°
74°
14
92°
73°
15
92°
73°
16
89°
72°
17
86°
65°
18
86°
64°
19
85°
66°
20
85°
71°
21
89°
72°
22
90°
73°
23
91°
72°
24
92°
71°
25
91°
70°
26
92°
66°
27
85°
65°
28
85°
70°
29
87°
71°
30
Hist. Avg.
86°
63°
31
Hist. Avg.
85°
62°
1
Hist. Avg.
85°
62°
2
Hist. Avg.
85°
62°
3
Hist. Avg.
85°
62°
4
Hist. Avg.
84°
61°
5
Hist. Avg.
84°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in St. Louis
St. Louis's August 2026 forecast shows daily high temperatures ranging from 84° to 93°, with overnight lows between 64° and 75°. The average high for August is 89° with an average low of 70°. 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.
