S
M
T
W
T
F
S
26
78°
53°
27
77°
54°
28
77°
55°
29
78°
54°
30
78°
54°
31
77°
55°
1
78°
56°
2
78°
61°
3
79°
60°
4
78°
55°
5
81°
56°
6
82°
61°
7
85°
62°
8
85°
62°
9
84°
63°
10
85°
57°
11
82°
54°
12
77°
56°
13
78°
55°
14
79°
55°
15
77°
59°
16
85°
62°
17
84°
62°
18
84°
54°
19
Hist. Avg.
80°
58°
20
Hist. Avg.
80°
57°
21
Hist. Avg.
80°
57°
22
Hist. Avg.
79°
57°
23
Hist. Avg.
79°
57°
24
Hist. Avg.
79°
57°
25
Hist. Avg.
79°
56°
26
Hist. Avg.
79°
56°
27
Hist. Avg.
78°
56°
28
Hist. Avg.
78°
56°
29
Hist. Avg.
78°
55°
30
Hist. Avg.
78°
55°
31
Hist. Avg.
78°
55°
1
Hist. Avg.
77°
55°
2
Hist. Avg.
77°
54°
3
Hist. Avg.
77°
54°
4
Hist. Avg.
77°
54°
5
Hist. Avg.
76°
53°
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 77° to 85°, with overnight lows between 53° and 63°. The average high for August is 80° with an average low of 57°. 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.
