S
M
T
W
T
F
S
30
81°
63°
31
82°
61°
1
86°
62°
2
89°
69°
3
90°
64°
4
89°
68°
5
85°
64°
6
80°
62°
7
76°
60°
8
79°
61°
9
81°
60°
10
78°
59°
11
77°
59°
12
76°
55°
13
76°
55°
14
80°
53°
15
79°
57°
16
73°
57°
17
72°
56°
18
76°
56°
19
73°
55°
20
72°
52°
21
73°
47°
22
73°
49°
23
74°
51°
24
77°
55°
25
78°
54°
26
72°
54°
27
69°
55°
28
71°
54°
29
73°
53°
30
75°
52°
1
69°
50°
2
69°
50°
3
72°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Mountain City
Mountain City's September 2026 forecast shows daily high temperatures ranging from 69° to 90°, with overnight lows between 47° and 69°. The average high for September is 77° with an average low of 56°. 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 Mountain City. See also: October | November | December.
