S
M
T
W
T
F
S
30
81°
69°
31
91°
72°
1
94°
77°
2
96°
78°
3
92°
79°
4
93°
78°
5
83°
73°
6
79°
65°
7
79°
64°
8
87°
72°
9
84°
66°
10
79°
61°
11
81°
64°
12
83°
67°
13
80°
64°
14
77°
59°
15
75°
60°
16
78°
62°
17
76°
60°
18
75°
62°
19
77°
57°
20
77°
63°
21
74°
62°
22
70°
61°
23
72°
61°
24
77°
60°
25
78°
62°
26
78°
61°
27
77°
62°
28
79°
62°
29
78°
61°
30
78°
61°
1
75°
56°
2
70°
50°
3
63°
47°
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 87°, with overnight lows between 47° and 72°. The average high for September is 77° with an average low of 61°. 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.
