S
M
T
W
T
F
S
30
91°
75°
31
90°
76°
1
91°
77°
2
90°
76°
3
90°
76°
4
91°
75°
5
91°
76°
6
90°
77°
7
89°
76°
8
90°
76°
9
91°
77°
10
90°
76°
11
91°
75°
12
89°
76°
13
90°
76°
14
90°
75°
15
91°
75°
16
91°
74°
17
89°
75°
18
89°
75°
19
90°
74°
20
89°
76°
21
91°
76°
22
91°
75°
23
90°
76°
24
90°
75°
25
89°
74°
26
90°
73°
27
88°
74°
28
89°
72°
29
87°
73°
30
87°
73°
1
88°
72°
2
88°
73°
3
89°
75°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Naples
Naples's September 2026 forecast shows daily high temperatures ranging from 87° to 91°, with overnight lows between 72° and 77°. The average high for September is 90° with an average low of 75°. 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 Naples. See also: October | November | December.
