S
M
T
W
T
F
S
30
88°
72°
31
89°
72°
1
92°
73°
2
95°
75°
3
93°
74°
4
96°
74°
5
92°
70°
6
84°
65°
7
84°
68°
8
84°
68°
9
89°
67°
10
90°
70°
11
87°
69°
12
83°
65°
13
85°
64°
14
82°
71°
15
86°
70°
16
84°
70°
17
82°
69°
18
82°
67°
19
79°
65°
20
79°
68°
21
80°
68°
22
80°
67°
23
81°
68°
24
83°
68°
25
81°
67°
26
77°
67°
27
80°
68°
28
80°
67°
29
77°
66°
30
78°
66°
1
76°
65°
2
77°
65°
3
79°
64°
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 76° to 96°, with overnight lows between 64° and 75°. The average high for September is 84° with an average low of 68°. 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.
