S
M
T
W
T
F
S
26
78°
61°
27
78°
67°
28
79°
67°
29
84°
68°
30
85°
65°
31
83°
68°
1
84°
68°
2
84°
67°
3
86°
68°
4
85°
67°
5
86°
68°
6
86°
67°
7
84°
64°
8
83°
61°
9
78°
64°
10
84°
60°
11
76°
59°
12
77°
59°
13
77°
60°
14
78°
58°
15
76°
60°
16
77°
59°
17
79°
64°
18
77°
63°
19
79°
64°
20
83°
65°
21
85°
65°
22
84°
65°
23
Hist. Avg.
79°
63°
24
Hist. Avg.
79°
63°
25
Hist. Avg.
79°
63°
26
Hist. Avg.
79°
63°
27
Hist. Avg.
78°
62°
28
Hist. Avg.
78°
62°
29
Hist. Avg.
78°
62°
30
Hist. Avg.
78°
62°
31
Hist. Avg.
78°
62°
1
Hist. Avg.
78°
61°
2
Hist. Avg.
77°
61°
3
Hist. Avg.
77°
61°
4
Hist. Avg.
77°
60°
5
Hist. Avg.
77°
60°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in St. Clair
St. Clair's August 2026 forecast shows daily high temperatures ranging from 76° to 86°, with overnight lows between 58° and 68°. The average high for August is 81° with an average low of 64°. 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.
