S
M
T
W
T
F
S
30
91°
68°
31
90°
64°
1
89°
64°
2
84°
65°
3
86°
67°
4
89°
67°
5
89°
66°
6
88°
68°
7
89°
67°
8
88°
66°
9
89°
66°
10
83°
67°
11
88°
66°
12
87°
62°
13
81°
63°
14
81°
65°
15
83°
64°
16
86°
61°
17
85°
61°
18
83°
58°
19
81°
60°
20
81°
63°
21
79°
58°
22
80°
58°
23
84°
59°
24
85°
62°
25
84°
63°
26
83°
61°
27
84°
58°
28
78°
57°
29
82°
55°
30
79°
55°
1
Hist. Avg.
79°
56°
2
Hist. Avg.
79°
56°
3
Hist. Avg.
78°
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 78° to 91°, with overnight lows between 55° and 68°. The average high for September is 85° with an average low of 63°. 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.
