S
M
T
W
T
F
S
30
80°
61°
31
79°
54°
1
76°
53°
2
72°
54°
3
72°
54°
4
73°
55°
5
71°
53°
6
70°
52°
7
71°
52°
8
71°
53°
9
72°
57°
10
69°
52°
11
72°
52°
12
73°
54°
13
71°
55°
14
72°
54°
15
68°
51°
16
68°
51°
17
66°
50°
18
67°
52°
19
67°
52°
20
70°
56°
21
Hist. Avg.
69°
51°
22
Hist. Avg.
68°
51°
23
Hist. Avg.
68°
51°
24
Hist. Avg.
68°
50°
25
Hist. Avg.
67°
50°
26
Hist. Avg.
67°
49°
27
Hist. Avg.
66°
49°
28
Hist. Avg.
66°
49°
29
Hist. Avg.
65°
48°
30
Hist. Avg.
65°
48°
1
Hist. Avg.
65°
48°
2
Hist. Avg.
64°
47°
3
Hist. Avg.
64°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Jefferson
Jefferson's September 2026 forecast shows daily high temperatures ranging from 66° to 80°, with overnight lows between 50° and 61°. The average high for September is 71° with an average low of 54°. 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.
