S
M
T
W
T
F
S
30
90°
70°
31
91°
70°
1
94°
71°
2
95°
71°
3
96°
72°
4
95°
72°
5
99°
71°
6
95°
71°
7
80°
65°
8
86°
64°
9
88°
69°
10
88°
71°
11
88°
69°
12
86°
68°
13
87°
68°
14
88°
67°
15
86°
68°
16
84°
66°
17
84°
63°
18
83°
62°
19
83°
63°
20
82°
60°
21
85°
64°
22
84°
63°
23
84°
64°
24
83°
63°
25
83°
63°
26
84°
62°
27
84°
63°
28
83°
63°
29
82°
62°
30
82°
61°
1
81°
61°
2
81°
58°
3
74°
55°
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 74° to 88°, with overnight lows between 55° and 71°. The average high for September is 84° with an average low of 64°. 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.
