S
M
T
W
T
F
S
30
65°
41°
31
65°
37°
1
68°
37°
2
69°
34°
3
71°
37°
4
72°
34°
5
73°
51°
6
76°
52°
7
70°
48°
8
73°
50°
9
73°
50°
10
69°
49°
11
69°
49°
12
65°
43°
13
62°
44°
14
67°
48°
15
64°
48°
16
65°
48°
17
64°
46°
18
62°
33°
19
60°
36°
20
54°
33°
21
63°
38°
22
59°
34°
23
60°
37°
24
59°
37°
25
56°
32°
26
57°
32°
27
60°
36°
28
55°
33°
29
56°
26°
30
47°
23°
1
47°
22°
2
48°
22°
3
49°
23°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jefferson
Jefferson's September 2026 forecast shows daily high temperatures ranging from 47° to 76°, with overnight lows between 22° and 52°. The average high for September is 61° with an average low of 39°. 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 Jefferson. See also: October | November | December.
