S
M
T
W
T
F
S
30
91°
70°
31
96°
70°
1
98°
73°
2
97°
76°
3
97°
76°
4
97°
73°
5
96°
72°
6
86°
65°
7
86°
56°
8
94°
60°
9
82°
67°
10
76°
64°
11
82°
64°
12
91°
62°
13
80°
57°
14
86°
56°
15
97°
72°
16
87°
69°
17
98°
71°
18
89°
72°
19
90°
67°
20
80°
62°
21
65°
55°
22
64°
51°
23
68°
51°
24
71°
55°
25
72°
54°
26
74°
56°
27
71°
52°
28
72°
53°
29
77°
54°
30
73°
53°
1
75°
52°
2
74°
48°
3
69°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jacksonville
Jacksonville's September 2026 forecast shows daily high temperatures ranging from 64° to 90°, with overnight lows between 48° and 67°. The average high for September is 73° with an average low of 55°. 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 Jacksonville. See also: October | November | December.
