S
M
T
W
T
F
S
30
85°
63°
31
84°
62°
1
76°
53°
2
75°
54°
3
76°
52°
4
80°
54°
5
79°
53°
6
73°
49°
7
78°
57°
8
79°
56°
9
81°
56°
10
76°
55°
11
78°
56°
12
81°
55°
13
75°
53°
14
73°
53°
15
76°
55°
16
79°
55°
17
80°
54°
18
79°
50°
19
70°
46°
20
69°
52°
21
73°
49°
22
72°
51°
23
73°
46°
24
66°
42°
25
66°
41°
26
65°
42°
27
65°
42°
28
66°
46°
29
70°
49°
30
72°
49°
1
73°
43°
2
63°
39°
3
63°
48°
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 63° to 85°, with overnight lows between 39° and 63°. The average high for September is 74° with an average low of 51°. 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.
