S
M
T
W
T
F
S
26
86°
69°
27
80°
68°
28
78°
66°
29
76°
62°
30
77°
63°
31
79°
67°
1
81°
69°
2
78°
68°
3
82°
69°
4
84°
67°
5
78°
65°
6
77°
67°
7
83°
67°
8
81°
66°
9
80°
67°
10
80°
64°
11
76°
63°
12
79°
67°
13
81°
66°
14
75°
61°
15
74°
59°
16
75°
62°
17
75°
65°
18
79°
66°
19
75°
66°
20
80°
65°
21
82°
64°
22
74°
60°
23
76°
64°
24
76°
63°
25
78°
63°
26
82°
58°
27
79°
56°
28
74°
55°
29
71°
56°
30
73°
56°
31
74°
63°
1
75°
64°
2
76°
65°
3
77°
58°
4
76°
53°
5
73°
55°
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 71° to 86°, with overnight lows between 53° and 69°. The average high for August is 78° with an average low of 63°. 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.
