S
M
T
W
T
F
S
31
85°
64°
1
84°
68°
2
80°
63°
3
85°
60°
4
88°
65°
5
91°
67°
6
85°
70°
7
81°
56°
8
83°
59°
9
82°
62°
10
85°
60°
11
88°
59°
12
88°
63°
13
88°
63°
14
88°
60°
15
88°
62°
16
88°
61°
17
90°
65°
18
91°
63°
19
93°
63°
20
92°
64°
21
89°
66°
22
88°
67°
23
90°
64°
24
91°
67°
25
85°
72°
26
85°
66°
27
86°
63°
28
87°
63°
29
84°
64°
30
83°
64°
1
85°
61°
2
81°
58°
3
79°
56°
4
81°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Jacksonville
Jacksonville's September 2025 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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.
