S
M
T
W
T
F
S
30
91°
69°
31
91°
67°
1
88°
67°
2
86°
68°
3
86°
66°
4
87°
65°
5
88°
68°
6
89°
67°
7
90°
64°
8
85°
64°
9
85°
63°
10
86°
64°
11
86°
64°
12
87°
67°
13
88°
67°
14
85°
63°
15
84°
62°
16
Hist. Avg.
87°
66°
17
Hist. Avg.
87°
66°
18
Hist. Avg.
86°
65°
19
Hist. Avg.
86°
65°
20
Hist. Avg.
86°
65°
21
Hist. Avg.
86°
64°
22
Hist. Avg.
86°
64°
23
Hist. Avg.
86°
64°
24
Hist. Avg.
85°
64°
25
Hist. Avg.
85°
63°
26
Hist. Avg.
85°
63°
27
Hist. Avg.
85°
63°
28
Hist. Avg.
85°
62°
29
Hist. Avg.
84°
62°
30
Hist. Avg.
84°
62°
1
Hist. Avg.
84°
61°
2
Hist. Avg.
84°
61°
3
Hist. Avg.
83°
60°
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 84° to 91°, with overnight lows between 62° and 69°. The average high for September is 87° 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.
