S
M
T
W
T
F
S
30
91°
82°
31
89°
79°
1
92°
81°
2
93°
80°
3
92°
76°
4
88°
77°
5
92°
77°
6
91°
77°
7
93°
78°
8
89°
77°
9
88°
78°
10
90°
77°
11
92°
76°
12
93°
77°
13
90°
76°
14
92°
77°
15
93°
76°
16
91°
77°
17
92°
76°
18
93°
76°
19
89°
73°
20
87°
75°
21
91°
76°
22
91°
76°
23
90°
75°
24
91°
76°
25
90°
75°
26
90°
75°
27
88°
74°
28
87°
74°
29
85°
75°
30
87°
74°
1
86°
71°
2
82°
66°
3
80°
66°
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 80° to 93°, with overnight lows between 66° and 78°. The average high for September is 89° with an average low of 75°. 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.
