S
M
T
W
T
F
S
30
74°
61°
31
76°
56°
1
77°
55°
2
74°
54°
3
73°
57°
4
75°
63°
5
79°
60°
6
79°
54°
7
74°
55°
8
72°
54°
9
75°
61°
10
77°
57°
11
74°
60°
12
71°
60°
13
71°
54°
14
70°
52°
15
68°
50°
16
69°
52°
17
69°
58°
18
73°
59°
19
76°
60°
20
77°
58°
21
74°
51°
22
72°
55°
23
67°
50°
24
72°
49°
25
65°
48°
26
65°
48°
27
Hist. Avg.
69°
53°
28
Hist. Avg.
68°
52°
29
Hist. Avg.
68°
52°
30
Hist. Avg.
68°
52°
1
Hist. Avg.
67°
51°
2
Hist. Avg.
67°
51°
3
Hist. Avg.
66°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in St. Clair Township
St. Clair Township's September 2026 forecast shows daily high temperatures ranging from 65° to 79°, with overnight lows between 48° and 63°. The average high for September is 73° with an average low of 55°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in St. Clair Township. See also: October | November | December.
