S
M
T
W
T
F
S
26
76°
59°
27
77°
61°
28
77°
65°
29
78°
66°
30
80°
67°
31
81°
68°
1
84°
67°
2
85°
68°
3
85°
68°
4
84°
60°
5
80°
59°
6
76°
58°
7
75°
58°
8
76°
59°
9
77°
59°
10
78°
61°
11
78°
65°
12
79°
66°
13
82°
67°
14
83°
66°
15
84°
62°
16
84°
59°
17
78°
59°
18
76°
57°
19
76°
58°
20
77°
60°
21
76°
61°
22
75°
58°
23
77°
61°
24
80°
64°
25
79°
57°
26
80°
58°
27
75°
59°
28
75°
66°
29
82°
64°
30
81°
65°
31
81°
63°
1
80°
64°
2
79°
61°
3
80°
60°
4
75°
61°
5
80°
62°
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 75° to 85°, with overnight lows between 57° and 68°. The average high for August is 79° 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.
