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
101°
76°
6
98°
75°
7
90°
72°
8
92°
71°
9
95°
68°
10
95°
67°
11
95°
73°
12
84°
70°
13
91°
69°
14
92°
71°
15
93°
72°
16
91°
68°
17
89°
67°
18
88°
66°
19
84°
62°
20
83°
62°
21
81°
61°
22
81°
61°
23
83°
63°
24
82°
60°
25
84°
64°
26
83°
62°
27
84°
63°
28
84°
63°
29
85°
64°
30
84°
64°
1
83°
62°
2
82°
62°
3
83°
61°
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 81° to 95°, with overnight lows between 60° and 73°. The average high for September is 86° with an average low of 65°. 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.
