S
M
T
W
T
F
S
30
87°
65°
31
N/A
1
98°
72°
2
99°
73°
3
101°
73°
4
97°
69°
5
85°
64°
6
83°
62°
7
84°
62°
8
81°
64°
9
86°
62°
10
83°
62°
11
83°
59°
12
76°
58°
13
77°
57°
14
83°
63°
15
79°
62°
16
75°
62°
17
75°
59°
18
74°
54°
19
73°
53°
20
73°
54°
21
76°
55°
22
78°
57°
23
80°
60°
24
81°
60°
25
79°
58°
26
76°
58°
27
77°
59°
28
76°
58°
29
79°
57°
30
74°
55°
1
71°
52°
2
70°
54°
3
75°
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 70° to 101°, with overnight lows between 52° and 73°. The average high for September is 81° with an average low of 60°. 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.
