S
M
T
W
T
F
S
30
90°
77°
31
89°
79°
1
90°
79°
2
88°
76°
3
88°
75°
4
89°
74°
5
92°
75°
6
91°
73°
7
87°
74°
8
87°
75°
9
89°
74°
10
90°
76°
11
92°
74°
12
92°
75°
13
90°
74°
14
90°
76°
15
91°
73°
16
88°
75°
17
87°
75°
18
86°
75°
19
87°
75°
20
85°
74°
21
85°
75°
22
86°
75°
23
86°
74°
24
87°
75°
25
85°
75°
26
86°
74°
27
86°
74°
28
87°
73°
29
82°
70°
30
83°
72°
1
82°
73°
2
82°
72°
3
83°
70°
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 82° to 92°, with overnight lows between 70° and 76°. The average high for September is 87° with an average low of 74°. 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.
