S
M
T
W
T
F
S
30
88°
67°
31
85°
68°
1
87°
70°
2
89°
68°
3
83°
67°
4
84°
69°
5
84°
69°
6
87°
70°
7
88°
71°
8
88°
70°
9
87°
70°
10
87°
71°
11
86°
70°
12
87°
70°
13
86°
69°
14
87°
69°
15
84°
68°
16
84°
68°
17
85°
65°
18
81°
67°
19
83°
67°
20
84°
66°
21
85°
67°
22
81°
66°
23
83°
66°
24
82°
67°
25
82°
65°
26
84°
63°
27
Hist. Avg.
81°
60°
28
Hist. Avg.
81°
60°
29
Hist. Avg.
80°
59°
30
Hist. Avg.
80°
59°
1
Hist. Avg.
80°
58°
2
Hist. Avg.
80°
58°
3
Hist. Avg.
79°
57°
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 81° to 89°, with overnight lows between 63° and 71°. The average high for September is 85° with an average low of 68°. 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.
