S
M
T
W
T
F
S
30
76°
47°
31
85°
53°
1
69°
57°
2
63°
56°
3
60°
54°
4
65°
54°
5
72°
53°
6
64°
56°
7
73°
53°
8
81°
49°
9
87°
52°
10
84°
52°
11
71°
48°
12
67°
53°
13
65°
52°
14
71°
50°
15
68°
50°
16
80°
51°
17
83°
51°
18
70°
49°
19
71°
46°
20
78°
47°
21
73°
50°
22
74°
51°
23
72°
46°
24
72°
48°
25
66°
42°
26
69°
43°
27
72°
40°
28
69°
45°
29
71°
52°
30
70°
47°
1
69°
46°
2
70°
44°
3
73°
46°
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 66° to 73°, with overnight lows between 40° and 52°. The average high for September is 70° with an average low of 45°. 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.
