S
M
T
W
T
F
S
30
76°
47°
31
85°
53°
1
69°
57°
2
63°
56°
3
60°
54°
4
65°
54°
5
72°
53°
6
64°
56°
7
73°
53°
8
81°
49°
9
87°
52°
10
84°
52°
11
71°
48°
12
67°
53°
13
65°
52°
14
71°
50°
15
68°
50°
16
80°
51°
17
83°
51°
18
70°
49°
19
71°
46°
20
78°
47°
21
73°
50°
22
74°
51°
23
72°
46°
24
72°
48°
25
67°
47°
26
72°
46°
27
73°
42°
28
70°
45°
29
74°
52°
30
75°
47°
1
67°
51°
2
68°
48°
3
71°
49°
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 75°, with overnight lows between 42° and 52°. The average high for September is 71° with an average low of 48°. 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.
