S
M
T
W
T
F
S
31
86°
63°
1
84°
67°
2
81°
66°
3
86°
67°
4
90°
66°
5
92°
67°
6
77°
66°
7
78°
60°
8
81°
61°
9
82°
59°
10
84°
59°
11
88°
62°
12
86°
62°
13
88°
58°
14
88°
60°
15
89°
63°
16
86°
63°
17
89°
65°
18
89°
64°
19
90°
62°
20
91°
62°
21
85°
66°
22
86°
64°
23
83°
69°
24
83°
69°
25
88°
70°
26
86°
69°
27
85°
64°
28
87°
63°
29
87°
65°
30
87°
65°
1
88°
66°
2
84°
60°
3
82°
56°
4
79°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chattanooga
Chattanooga's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
