S
M
T
W
T
F
S
30
89°
62°
31
90°
68°
1
91°
70°
2
93°
70°
3
94°
71°
4
92°
71°
5
83°
70°
6
80°
61°
7
83°
58°
8
87°
61°
9
89°
68°
10
79°
71°
11
80°
67°
12
81°
67°
13
85°
69°
14
73°
58°
15
86°
50°
16
90°
64°
17
90°
71°
18
80°
65°
19
85°
63°
20
78°
68°
21
73°
57°
22
65°
56°
23
70°
59°
24
68°
50°
25
71°
43°
26
72°
45°
27
74°
46°
28
74°
46°
29
75°
51°
30
78°
61°
1
85°
62°
2
75°
55°
3
67°
55°
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 67° to 85°, with overnight lows between 51° and 62°. The average high for September is 76° with an average low of 57°. 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.
