S
M
T
W
T
F
S
30
107°
78°
31
105°
72°
1
103°
70°
2
104°
75°
3
103°
79°
4
101°
73°
5
102°
76°
6
101°
72°
7
102°
75°
8
103°
76°
9
92°
67°
10
89°
66°
11
93°
69°
12
95°
70°
13
95°
65°
14
81°
58°
15
76°
60°
16
83°
62°
17
85°
61°
18
80°
59°
19
80°
59°
20
73°
46°
21
86°
62°
22
85°
63°
23
86°
62°
24
81°
62°
25
73°
61°
26
78°
61°
27
79°
60°
28
78°
60°
29
74°
59°
30
80°
49°
1
67°
46°
2
68°
45°
3
67°
45°
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 67° to 103°, with overnight lows between 45° and 76°. The average high for September is 83° with an average low of 60°. 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.
