S
M
T
W
T
F
S
30
87°
76°
31
86°
75°
1
88°
75°
2
86°
74°
3
86°
75°
4
88°
74°
5
87°
74°
6
86°
73°
7
86°
73°
8
87°
72°
9
88°
73°
10
87°
73°
11
91°
69°
12
90°
68°
13
88°
71°
14
90°
68°
15
87°
69°
16
88°
70°
17
89°
68°
18
86°
71°
19
89°
72°
20
89°
71°
21
88°
68°
22
87°
66°
23
83°
66°
24
83°
65°
25
82°
65°
26
82°
66°
27
83°
64°
28
87°
65°
29
85°
67°
30
87°
64°
1
87°
64°
2
86°
62°
3
87°
61°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Slidell
Slidell's September 2026 forecast shows daily high temperatures ranging from 82° to 91°, with overnight lows between 61° and 76°. The average high for September is 87° with an average low of 69°. 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 Slidell. See also: October | November | December.
