S
M
T
W
T
F
S
30
90°
73°
31
93°
72°
1
93°
73°
2
95°
75°
3
93°
73°
4
93°
75°
5
92°
75°
6
N/A
7
86°
71°
8
86°
71°
9
84°
70°
10
88°
69°
11
87°
72°
12
88°
69°
13
88°
69°
14
90°
68°
15
89°
67°
16
86°
66°
17
86°
66°
18
88°
64°
19
85°
65°
20
86°
63°
21
88°
66°
22
88°
65°
23
87°
66°
24
86°
65°
25
86°
65°
26
85°
64°
27
86°
65°
28
86°
65°
29
85°
64°
30
85°
64°
1
84°
63°
2
85°
62°
3
83°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Jacksonville
Jacksonville's September 2026 forecast shows daily high temperatures ranging from 83° to 90°, with overnight lows between 62° and 72°. The average high for September is 86° with an average low of 66°. 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.
