S
M
T
W
T
F
S
30
93°
69°
31
93°
71°
1
95°
71°
2
97°
71°
3
97°
72°
4
98°
74°
5
93°
75°
6
94°
73°
7
89°
69°
8
89°
68°
9
91°
68°
10
92°
69°
11
94°
69°
12
86°
70°
13
89°
69°
14
91°
68°
15
94°
68°
16
91°
70°
17
93°
69°
18
95°
71°
19
92°
70°
20
93°
70°
21
90°
72°
22
83°
69°
23
81°
66°
24
78°
63°
25
78°
59°
26
79°
53°
27
78°
50°
28
78°
52°
29
82°
51°
30
85°
54°
1
87°
58°
2
88°
63°
3
77°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Knoxville
Knoxville's September 2026 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 Knoxville. See also: October | November | December.
