S
M
T
W
T
F
S
30
85°
58°
31
83°
67°
1
92°
68°
2
78°
67°
3
85°
69°
4
85°
67°
5
80°
58°
6
78°
56°
7
77°
51°
8
83°
50°
9
87°
57°
10
86°
68°
11
81°
60°
12
79°
57°
13
85°
67°
14
75°
48°
15
76°
43°
16
85°
53°
17
86°
66°
18
82°
55°
19
75°
65°
20
75°
61°
21
68°
59°
22
67°
54°
23
66°
53°
24
67°
54°
25
71°
53°
26
73°
49°
27
74°
53°
28
72°
55°
29
75°
55°
30
72°
38°
1
71°
53°
2
74°
53°
3
66°
52°
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 86°, with overnight lows between 38° and 66°. The average high for September is 73° with an average low of 55°. 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.
