S
M
T
W
T
F
S
30
82°
59°
31
82°
59°
1
81°
58°
2
82°
58°
3
80°
55°
4
75°
54°
5
76°
52°
6
79°
54°
7
81°
57°
8
82°
57°
9
81°
58°
10
82°
58°
11
82°
57°
12
81°
58°
13
80°
57°
14
81°
55°
15
82°
55°
16
81°
52°
17
78°
54°
18
71°
46°
19
72°
45°
20
72°
44°
21
73°
45°
22
74°
49°
23
75°
52°
24
77°
44°
25
73°
43°
26
70°
43°
27
70°
48°
28
74°
47°
29
73°
50°
30
74°
43°
1
70°
48°
2
73°
48°
3
73°
47°
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 70° to 82°, with overnight lows between 43° and 59°. The average high for September is 77° with an average low of 52°. 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.
