S
M
T
W
T
F
S
30
75°
48°
31
76°
55°
1
77°
57°
2
84°
56°
3
85°
56°
4
78°
48°
5
74°
47°
6
76°
51°
7
74°
46°
8
75°
47°
9
74°
52°
10
72°
53°
11
73°
50°
12
73°
47°
13
72°
52°
14
73°
54°
15
80°
52°
16
81°
46°
17
78°
48°
18
76°
46°
19
79°
46°
20
79°
53°
21
78°
50°
22
75°
46°
23
72°
49°
24
70°
47°
25
68°
46°
26
72°
45°
27
69°
52°
28
68°
51°
29
67°
49°
30
68°
49°
1
74°
52°
2
73°
50°
3
72°
48°
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 67° to 85°, with overnight lows between 45° and 57°. The average high for September is 75° with an average low of 50°. 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.
