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°
72°
12
83°
70°
13
87°
67°
14
91°
68°
15
92°
68°
16
92°
68°
17
88°
67°
18
85°
64°
19
83°
59°
20
77°
59°
21
80°
57°
22
81°
59°
23
80°
60°
24
81°
56°
25
83°
57°
26
82°
57°
27
83°
59°
28
83°
59°
29
82°
58°
30
83°
59°
1
81°
57°
2
79°
56°
3
81°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in South Knoxville
South Knoxville's September 2026 forecast shows daily high temperatures ranging from 77° to 94°, with overnight lows between 56° and 72°. The average high for September is 84° with an average low of 61°. 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 South Knoxville. See also: October | November | December.
