S
M
T
W
T
F
S
30
87°
64°
31
87°
64°
1
88°
65°
2
87°
65°
3
87°
64°
4
86°
63°
5
87°
64°
6
88°
64°
7
88°
65°
8
87°
64°
9
87°
63°
10
85°
62°
11
86°
64°
12
88°
64°
13
87°
62°
14
76°
51°
15
74°
58°
16
76°
59°
17
75°
53°
18
80°
51°
19
75°
49°
20
78°
50°
21
78°
54°
22
81°
57°
23
82°
51°
24
75°
48°
25
73°
53°
26
76°
56°
27
81°
49°
28
77°
46°
29
70°
45°
30
71°
50°
1
73°
53°
2
78°
53°
3
79°
52°
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 70° to 88°, with overnight lows between 45° and 65°. The average high for September is 81° 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.
