S
M
T
W
T
F
S
30
79°
55°
31
79°
57°
1
78°
57°
2
79°
56°
3
79°
48°
4
71°
47°
5
70°
50°
6
73°
56°
7
77°
56°
8
78°
55°
9
72°
49°
10
71°
54°
11
76°
53°
12
75°
55°
13
76°
55°
14
76°
54°
15
75°
53°
16
75°
52°
17
70°
50°
18
74°
46°
19
66°
43°
20
66°
42°
21
63°
41°
22
64°
49°
23
67°
45°
24
66°
41°
25
64°
42°
26
64°
49°
27
69°
48°
28
70°
49°
29
69°
48°
30
69°
46°
1
63°
47°
2
68°
46°
3
62°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Knox
Knox's September 2026 forecast shows daily high temperatures ranging from 62° to 79°, with overnight lows between 41° and 57°. The average high for September is 71° with an average low of 50°. 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 Knox. See also: October | November | December.
