S
M
T
W
T
F
S
30
79°
51°
31
75°
57°
1
73°
58°
2
73°
55°
3
80°
61°
4
82°
57°
5
80°
51°
6
73°
50°
7
73°
50°
8
72°
53°
9
76°
55°
10
72°
50°
11
70°
46°
12
70°
46°
13
69°
49°
14
70°
46°
15
68°
45°
16
67°
44°
17
66°
43°
18
66°
43°
19
67°
44°
20
66°
44°
21
66°
45°
22
67°
47°
23
69°
51°
24
71°
51°
25
72°
50°
26
72°
43°
27
71°
42°
28
63°
50°
29
63°
48°
30
70°
47°
1
68°
48°
2
64°
42°
3
61°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lannon
Lannon's September 2026 forecast shows daily high temperatures ranging from 61° to 82°, with overnight lows between 42° and 61°. The average high for September is 70° with an average low of 49°. 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 Lannon. See also: October | November | December.
