The weather in Slidell in September is very hot. The average temperatures are between 23°C and 30°C, drinking water regularly is advisable.
You can expect rain for roughly half of the month of September in Slidell. We’re expecting roughly 8 to 15 days of rain, so your rubber boots and umbrella are going to see plenty of use this month if you’re keen on staying dry.
Our weather forecast can give you a great sense of what weather to expect in Slidell in September 2025.
If you’re planning to visit Slidell in the near future, we highly recommend that you review the 14 day weather forecast for Slidell before you arrive.
Temperatures
30° / 23°
Rainy Days
12
Snowy Days
0
Dry Days
18
Rainfall
142
mm
Sun Hours
7.2
Hrs
