S
M
T
W
T
F
S
30
91°
77°
31
90°
76°
1
91°
77°
2
90°
73°
3
90°
73°
4
89°
74°
5
89°
73°
6
90°
73°
7
90°
74°
8
91°
75°
9
91°
75°
10
92°
74°
11
92°
73°
12
91°
76°
13
92°
76°
14
92°
75°
15
91°
74°
16
92°
75°
17
91°
74°
18
89°
74°
19
90°
73°
20
89°
73°
21
90°
74°
22
90°
74°
23
87°
73°
24
88°
74°
25
Hist. Avg.
86°
70°
26
Hist. Avg.
86°
69°
27
Hist. Avg.
86°
69°
28
Hist. Avg.
86°
69°
29
Hist. Avg.
86°
68°
30
Hist. Avg.
85°
68°
1
Hist. Avg.
85°
68°
2
Hist. Avg.
85°
67°
3
Hist. Avg.
84°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Jefferson
Jefferson's September 2026 forecast shows daily high temperatures ranging from 87° to 92°, with overnight lows between 73° and 77°. The average high for September is 90° with an average low of 74°. 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.
