S
M
T
W
T
F
S
30
104°
75°
31
101°
71°
1
99°
75°
2
95°
74°
3
98°
75°
4
100°
71°
5
98°
71°
6
99°
71°
7
101°
75°
8
98°
74°
9
97°
73°
10
96°
73°
11
98°
74°
12
98°
71°
13
97°
72°
14
95°
71°
15
91°
69°
16
92°
69°
17
91°
68°
18
93°
68°
19
91°
64°
20
88°
62°
21
92°
68°
22
92°
68°
23
91°
67°
24
91°
67°
25
90°
66°
26
90°
66°
27
89°
65°
28
89°
65°
29
88°
64°
30
87°
63°
1
83°
55°
2
77°
53°
3
78°
53°
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 77° to 101°, with overnight lows between 53° and 75°. The average high for September is 91° with an average low of 67°. 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.
