S
M
T
W
T
F
S
30
90°
77°
31
89°
79°
1
90°
79°
2
89°
79°
3
86°
79°
4
91°
77°
5
90°
76°
6
93°
74°
7
88°
75°
8
89°
78°
9
91°
79°
10
90°
76°
11
92°
76°
12
90°
75°
13
91°
76°
14
94°
78°
15
89°
77°
16
87°
78°
17
87°
77°
18
86°
78°
19
90°
75°
20
84°
78°
21
88°
75°
22
88°
75°
23
87°
77°
24
79°
69°
25
76°
65°
26
80°
64°
27
87°
62°
28
91°
67°
29
90°
68°
30
89°
70°
1
90°
74°
2
87°
73°
3
86°
75°
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 86° to 91°, with overnight lows between 67° and 75°. The average high for September is 89° with an average low of 71°. 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.
