S
M
T
W
T
F
S
30
90°
74°
31
93°
73°
1
94°
73°
2
96°
75°
3
95°
73°
4
93°
76°
5
91°
75°
6
96°
72°
7
90°
69°
8
91°
70°
9
90°
72°
10
94°
73°
11
91°
73°
12
90°
74°
13
92°
73°
14
93°
72°
15
91°
69°
16
87°
67°
17
88°
69°
18
87°
71°
19
86°
66°
20
85°
66°
21
82°
65°
22
77°
63°
23
83°
64°
24
82°
53°
25
83°
65°
26
82°
64°
27
82°
64°
28
85°
63°
29
86°
64°
30
86°
64°
1
85°
63°
2
85°
64°
3
84°
63°
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 77° to 93°, with overnight lows between 53° and 74°. The average high for September is 86° with an average low of 66°. 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.
