S
M
T
W
T
F
S
30
93°
71°
31
93°
72°
1
92°
71°
2
92°
72°
3
91°
72°
4
92°
71°
5
91°
69°
6
92°
70°
7
91°
72°
8
90°
71°
9
88°
71°
10
89°
70°
11
89°
70°
12
90°
71°
13
87°
71°
14
86°
70°
15
87°
71°
16
87°
70°
17
86°
70°
18
86°
69°
19
87°
66°
20
85°
64°
21
84°
66°
22
86°
68°
23
86°
68°
24
85°
67°
25
87°
68°
26
88°
67°
27
87°
67°
28
88°
66°
29
86°
66°
30
86°
65°
1
84°
66°
2
86°
64°
3
Hist. Avg.
85°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Old Jefferson
Old Jefferson's September 2026 forecast shows daily high temperatures ranging from 84° to 93°, with overnight lows between 64° and 72°. The average high for September is 88° with an average low of 69°. 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 Old Jefferson. See also: October | November | December.
