S
M
T
W
T
F
S
30
76°
61°
31
78°
60°
1
76°
56°
2
70°
55°
3
70°
53°
4
71°
55°
5
72°
56°
6
75°
60°
7
78°
60°
8
78°
59°
9
77°
60°
10
78°
59°
11
76°
59°
12
78°
58°
13
78°
60°
14
78°
49°
15
66°
50°
16
66°
48°
17
68°
51°
18
68°
47°
19
66°
48°
20
66°
50°
21
74°
53°
22
75°
54°
23
75°
45°
24
66°
43°
25
66°
47°
26
71°
53°
27
72°
53°
28
69°
46°
29
67°
41°
30
61°
43°
1
61°
51°
2
67°
47°
3
70°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lyons
Lyons's September 2026 forecast shows daily high temperatures ranging from 61° to 78°, with overnight lows between 41° and 61°. The average high for September is 72° with an average low of 53°. 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 Lyons. See also: October | November | December.
