S
M
T
W
T
F
S
30
79°
59°
31
78°
54°
1
77°
55°
2
77°
53°
3
76°
52°
4
76°
51°
5
77°
56°
6
76°
56°
7
76°
55°
8
77°
55°
9
76°
51°
10
76°
58°
11
80°
59°
12
80°
59°
13
81°
57°
14
79°
58°
15
81°
57°
16
80°
56°
17
79°
57°
18
80°
56°
19
79°
55°
20
77°
49°
21
80°
47°
22
74°
45°
23
Hist. Avg.
74°
53°
24
Hist. Avg.
74°
53°
25
Hist. Avg.
74°
52°
26
Hist. Avg.
73°
52°
27
Hist. Avg.
73°
52°
28
Hist. Avg.
72°
51°
29
Hist. Avg.
72°
51°
30
Hist. Avg.
72°
51°
1
Hist. Avg.
71°
50°
2
Hist. Avg.
71°
50°
3
Hist. Avg.
70°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Knox
Knox's September 2026 forecast shows daily high temperatures ranging from 74° to 81°, with overnight lows between 45° and 59°. The average high for September is 78° 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.
