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
75°
38°
6
76°
38°
7
71°
43°
8
73°
39°
9
73°
33°
10
72°
29°
11
73°
47°
12
73°
49°
13
75°
50°
14
70°
44°
15
66°
48°
16
63°
47°
17
64°
44°
18
63°
47°
19
65°
45°
20
64°
46°
21
63°
45°
22
60°
44°
23
60°
42°
24
59°
31°
25
55°
29°
26
57°
33°
27
62°
36°
28
61°
36°
29
52°
30°
30
56°
30°
1
57°
31°
2
61°
33°
3
61°
33°
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 52° to 75°, with overnight lows between 29° and 50°. The average high for September is 63° with an average low of 40°. 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.
