S
M
T
W
T
F
S
31
75°
42°
1
79°
44°
2
81°
46°
3
81°
47°
4
67°
60°
5
72°
41°
6
65°
45°
7
69°
38°
8
70°
38°
9
76°
39°
10
78°
44°
11
79°
45°
12
80°
46°
13
78°
48°
14
82°
47°
15
84°
50°
16
83°
46°
17
83°
48°
18
86°
49°
19
82°
56°
20
81°
53°
21
76°
56°
22
74°
60°
23
73°
57°
24
75°
62°
25
74°
57°
26
78°
52°
27
84°
50°
28
80°
53°
29
82°
47°
30
80°
46°
1
77°
48°
2
77°
41°
3
85°
42°
4
88°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Lyon
South Lyon's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 South Lyon. See also: October | November | December.
