S
M
T
W
T
F
S
30
95°
64°
31
98°
69°
1
98°
73°
2
97°
73°
3
98°
75°
4
100°
74°
5
103°
75°
6
N/A
7
98°
66°
8
100°
75°
9
101°
75°
10
94°
72°
11
92°
69°
12
99°
69°
13
95°
70°
14
92°
69°
15
90°
67°
16
90°
65°
17
89°
68°
18
92°
66°
19
89°
67°
20
84°
60°
21
90°
67°
22
89°
65°
23
88°
65°
24
88°
64°
25
87°
66°
26
87°
65°
27
86°
64°
28
87°
65°
29
86°
64°
30
86°
63°
1
81°
55°
2
73°
53°
3
74°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Jacksonville
Jacksonville's September 2026 forecast shows daily high temperatures ranging from 73° to 101°, with overnight lows between 50° and 75°. The average high for September is 89° with an average low of 65°. 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.
