S
M
T
W
T
F
S
30
82°
66°
31
90°
68°
1
92°
73°
2
94°
72°
3
95°
73°
4
90°
72°
5
87°
68°
6
80°
55°
7
82°
56°
8
83°
67°
9
81°
64°
10
76°
46°
11
77°
56°
12
81°
63°
13
79°
63°
14
80°
61°
15
73°
55°
16
69°
52°
17
73°
53°
18
74°
52°
19
74°
52°
20
73°
51°
21
72°
56°
22
68°
56°
23
69°
55°
24
76°
56°
25
76°
56°
26
76°
55°
27
76°
56°
28
77°
56°
29
77°
57°
30
76°
56°
1
75°
52°
2
73°
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 83°, with overnight lows between 42° and 67°. The average high for September is 75° with an average low of 55°. 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.
