S
M
T
W
T
F
S
30
79°
57°
31
78°
51°
1
78°
47°
2
71°
48°
3
70°
52°
4
75°
57°
5
77°
55°
6
78°
47°
7
71°
48°
8
72°
51°
9
76°
52°
10
68°
54°
11
75°
54°
12
75°
53°
13
74°
52°
14
66°
47°
15
66°
44°
16
67°
43°
17
66°
52°
18
67°
44°
19
65°
53°
20
70°
52°
21
72°
46°
22
67°
41°
23
63°
43°
24
62°
42°
25
61°
41°
26
64°
45°
27
68°
48°
28
Hist. Avg.
65°
45°
29
Hist. Avg.
65°
44°
30
Hist. Avg.
64°
44°
1
Hist. Avg.
64°
44°
2
Hist. Avg.
63°
43°
3
Hist. Avg.
63°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Lyon Mountain
Lyon Mountain's September 2026 forecast shows daily high temperatures ranging from 61° to 79°, with overnight lows between 41° and 57°. 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 Lyon Mountain. See also: October | November | December.
