S
M
T
W
T
F
S
26
91°
73°
27
90°
77°
28
86°
70°
29
87°
69°
30
82°
68°
31
71°
63°
1
82°
61°
2
81°
63°
3
82°
65°
4
73°
54°
5
75°
56°
6
83°
60°
7
84°
64°
8
86°
66°
9
81°
65°
10
83°
67°
11
78°
60°
12
79°
61°
13
80°
60°
14
81°
61°
15
80°
59°
16
84°
63°
17
84°
65°
18
86°
64°
19
83°
63°
20
83°
63°
21
84°
65°
22
85°
64°
23
84°
63°
24
81°
63°
25
80°
61°
26
74°
60°
27
73°
59°
28
79°
60°
29
82°
61°
30
83°
62°
31
83°
61°
1
82°
62°
2
83°
62°
3
84°
63°
4
84°
62°
5
83°
61°
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 54° and 67°. The average high for August is 81° with an average low of 62°. 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.
