S
M
T
W
T
F
S
26
78°
58°
27
78°
60°
28
79°
56°
29
78°
58°
30
79°
65°
31
81°
65°
1
86°
64°
2
85°
65°
3
85°
65°
4
84°
57°
5
81°
56°
6
78°
54°
7
77°
56°
8
76°
56°
9
77°
57°
10
78°
61°
11
79°
62°
12
82°
65°
13
84°
64°
14
83°
59°
15
84°
56°
16
77°
56°
17
78°
55°
18
79°
58°
19
80°
56°
20
75°
54°
21
80°
59°
22
80°
61°
23
82°
61°
24
81°
56°
25
75°
52°
26
76°
57°
27
78°
60°
28
74°
58°
29
82°
61°
30
83°
55°
31
78°
57°
1
74°
56°
2
74°
56°
3
73°
58°
4
75°
59°
5
81°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Clair
St. Clair's August 2026 forecast shows daily high temperatures ranging from 73° to 86°, with overnight lows between 52° and 65°. The average high for August is 79° with an average low of 58°. 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. Clair. See also: September | October | November.
