S
M
T
W
T
F
S
30
95°
64°
31
98°
69°
1
98°
73°
2
97°
73°
3
98°
75°
4
100°
74°
5
103°
75°
6
102°
75°
7
99°
76°
8
101°
69°
9
99°
76°
10
98°
74°
11
91°
71°
12
97°
72°
13
97°
72°
14
100°
74°
15
97°
76°
16
96°
72°
17
96°
69°
18
91°
66°
19
87°
64°
20
85°
62°
21
86°
60°
22
87°
62°
23
86°
63°
24
83°
59°
25
88°
65°
26
87°
65°
27
87°
63°
28
86°
63°
29
87°
64°
30
84°
63°
1
85°
62°
2
84°
61°
3
85°
61°
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 83° to 100°, with overnight lows between 59° and 76°. The average high for September is 89° 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.
