S
M
T
W
T
F
S
26
93°
71°
27
93°
71°
28
92°
72°
29
94°
71°
30
94°
71°
31
93°
70°
1
93°
72°
2
95°
71°
3
93°
70°
4
93°
71°
5
94°
72°
6
94°
72°
7
93°
71°
8
91°
69°
9
92°
69°
10
88°
65°
11
89°
69°
12
91°
70°
13
92°
69°
14
93°
70°
15
94°
71°
16
93°
70°
17
93°
63°
18
92°
61°
19
85°
60°
20
83°
60°
21
84°
61°
22
84°
61°
23
85°
62°
24
85°
61°
25
86°
61°
26
88°
65°
27
90°
60°
28
84°
59°
29
84°
60°
30
86°
60°
31
88°
62°
1
89°
60°
2
83°
59°
3
82°
65°
4
88°
66°
5
86°
64°
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 82° to 95°, with overnight lows between 59° and 72°. The average high for August is 90° with an average low of 66°. 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.
