S
M
T
W
T
F
S
26
97°
74°
27
97°
78°
28
91°
75°
29
87°
68°
30
89°
65°
31
79°
69°
1
76°
69°
2
82°
67°
3
88°
63°
4
89°
64°
5
88°
66°
6
76°
67°
7
91°
68°
8
89°
68°
9
92°
71°
10
92°
74°
11
96°
77°
12
93°
74°
13
95°
74°
14
93°
79°
15
93°
76°
16
93°
73°
17
83°
68°
18
87°
64°
19
81°
71°
20
86°
68°
21
88°
68°
22
87°
65°
23
82°
61°
24
83°
65°
25
84°
71°
26
87°
68°
27
87°
68°
28
85°
67°
29
84°
65°
30
82°
69°
31
82°
66°
1
84°
65°
2
86°
65°
3
85°
64°
4
85°
70°
5
80°
66°
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 80° to 88°, with overnight lows between 61° and 71°. The average high for August is 84° with an average low of 66°. 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.
