S
M
T
W
T
F
S
30
89°
68°
31
88°
69°
1
89°
68°
2
89°
69°
3
88°
68°
4
86°
67°
5
87°
67°
6
87°
66°
7
88°
67°
8
89°
67°
9
89°
68°
10
88°
67°
11
88°
68°
12
87°
67°
13
88°
67°
14
85°
64°
15
88°
65°
16
87°
63°
17
86°
64°
18
87°
60°
19
83°
55°
20
78°
56°
21
79°
55°
22
80°
55°
23
83°
59°
24
83°
61°
25
82°
57°
26
79°
56°
27
77°
59°
28
79°
59°
29
79°
58°
30
81°
57°
1
81°
58°
2
80°
58°
3
81°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Lookout Mountain
Lookout Mountain's September 2026 forecast shows daily high temperatures ranging from 77° to 89°, with overnight lows between 55° and 69°. The average high for September is 85° with an average low of 63°. 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 Lookout Mountain. See also: October | November | December.
