S
M
T
W
T
F
S
30
79°
62°
31
83°
60°
1
84°
62°
2
86°
64°
3
87°
65°
4
86°
64°
5
80°
67°
6
73°
62°
7
69°
60°
8
74°
56°
9
79°
56°
10
79°
62°
11
82°
64°
12
76°
65°
13
79°
65°
14
79°
64°
15
71°
60°
16
83°
59°
17
84°
58°
18
82°
66°
19
78°
62°
20
79°
60°
21
81°
60°
22
73°
59°
23
58°
52°
24
60°
49°
25
64°
42°
26
70°
45°
27
66°
48°
28
68°
47°
29
73°
50°
30
74°
52°
1
75°
57°
2
73°
56°
3
72°
58°
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 64° to 75°, with overnight lows between 42° and 58°. The average high for September is 71° with an average low of 51°. 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.
