S
M
T
W
T
F
S
26
70°
54°
27
71°
43°
28
59°
51°
29
58°
51°
30
57°
52°
31
60°
52°
1
62°
51°
2
57°
52°
3
60°
51°
4
57°
52°
5
57°
52°
6
56°
51°
7
59°
52°
8
58°
50°
9
56°
50°
10
56°
51°
11
55°
50°
12
56°
52°
13
60°
52°
14
59°
51°
15
56°
51°
16
56°
50°
17
57°
52°
18
60°
51°
19
56°
51°
20
60°
49°
21
55°
49°
22
54°
48°
23
54°
49°
24
58°
44°
25
55°
44°
26
53°
43°
27
56°
44°
28
53°
42°
29
54°
43°
30
53°
42°
31
53°
42°
1
54°
46°
2
53°
44°
3
60°
42°
4
53°
43°
5
52°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Lewis
St. Lewis's August 2026 forecast shows daily high temperatures ranging from 52° to 71°, with overnight lows between 42° and 54°. The average high for August is 57° with an average low of 48°. 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. Lewis. See also: September | October | November.
