S
M
T
W
T
F
S
30
73°
63°
31
85°
66°
1
89°
71°
2
92°
70°
3
83°
68°
4
76°
64°
5
76°
56°
6
76°
54°
7
75°
53°
8
81°
68°
9
84°
66°
10
76°
54°
11
75°
54°
12
77°
62°
13
79°
61°
14
77°
62°
15
76°
59°
16
72°
51°
17
74°
55°
18
73°
52°
19
68°
51°
20
67°
50°
21
73°
56°
22
67°
55°
23
68°
55°
24
72°
54°
25
74°
56°
26
75°
54°
27
70°
54°
28
74°
55°
29
75°
56°
30
75°
56°
1
74°
55°
2
71°
51°
3
65°
48°
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 65° to 84°, with overnight lows between 48° and 68°. The average high for September is 74° with an average low of 56°. 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.
