S
M
T
W
T
F
S
30
81°
67°
31
81°
67°
1
79°
66°
2
78°
66°
3
78°
65°
4
77°
63°
5
77°
60°
6
78°
61°
7
81°
63°
8
80°
63°
9
77°
62°
10
78°
63°
11
75°
58°
12
78°
58°
13
81°
61°
14
79°
56°
15
74°
56°
16
73°
55°
17
74°
56°
18
75°
57°
19
80°
56°
20
80°
56°
21
79°
60°
22
79°
62°
23
78°
60°
24
75°
58°
25
77°
58°
26
78°
60°
27
78°
57°
28
77°
59°
29
78°
59°
30
78°
58°
1
77°
59°
2
77°
59°
3
76°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Signal Mountain
Signal Mountain's September 2026 forecast shows daily high temperatures ranging from 73° to 81°, with overnight lows between 51° and 67°. The average high for September is 78° with an average low of 60°. 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 Signal Mountain. See also: October | November | December.
