S
M
T
W
T
F
S
30
81°
55°
31
78°
52°
1
77°
52°
2
76°
54°
3
77°
55°
4
77°
53°
5
78°
53°
6
74°
60°
7
80°
57°
8
78°
53°
9
75°
54°
10
75°
51°
11
74°
51°
12
75°
52°
13
74°
53°
14
73°
52°
15
74°
56°
16
74°
54°
17
76°
50°
18
78°
49°
19
73°
57°
20
79°
54°
21
71°
46°
22
70°
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 70° to 81°, with overnight lows between 45° and 60°. The average high for September is 76° with an average low of 53°. 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.
