S
M
T
W
T
F
S
30
97°
74°
31
96°
73°
1
95°
72°
2
95°
73°
3
96°
73°
4
96°
72°
5
95°
72°
6
94°
71°
7
94°
71°
8
93°
70°
9
95°
71°
10
95°
72°
11
94°
71°
12
95°
70°
13
94°
71°
14
94°
69°
15
95°
68°
16
93°
68°
17
94°
69°
18
94°
65°
19
92°
59°
20
85°
59°
21
86°
60°
22
90°
60°
23
91°
65°
24
91°
65°
25
90°
64°
26
90°
62°
27
89°
64°
28
88°
56°
29
83°
58°
30
85°
63°
1
88°
62°
2
88°
59°
3
87°
57°
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 83° to 97°, with overnight lows between 56° and 74°. The average high for September is 92° with an average low of 67°. 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.
