S
M
T
W
T
F
S
30
93°
72°
31
96°
72°
1
98°
72°
2
100°
74°
3
100°
75°
4
101°
75°
5
98°
71°
6
96°
72°
7
88°
71°
8
90°
70°
9
89°
69°
10
91°
71°
11
89°
69°
12
89°
70°
13
88°
68°
14
89°
67°
15
91°
68°
16
92°
68°
17
89°
67°
18
86°
62°
19
77°
67°
20
79°
66°
21
87°
66°
22
85°
66°
23
85°
65°
24
84°
66°
25
85°
65°
26
85°
65°
27
86°
64°
28
85°
65°
29
85°
65°
30
84°
64°
1
84°
64°
2
80°
58°
3
74°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chattanooga
Chattanooga's September 2026 forecast shows daily high temperatures ranging from 74° to 98°, with overnight lows between 54° and 72°. The average high for September is 87° with an average low of 66°. 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 Chattanooga. See also: October | November | December.
