Click on a day for an hourly weather forecast
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.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 16° / 8° | 7 | 24 | 0 | 100 mm | Ok | Slidell in January |
| February | 18° / 10° | 7 | 21 | 0 | 128 mm | Ok | Slidell in February |
| March | 21° / 13° | 7 | 24 | 0 | 123 mm | Ok | Slidell in March |
| April | 25° / 16° | 7 | 23 | 0 | 146 mm | Good | Slidell in April |
| May | 28° / 20° | 9 | 22 | 0 | 147 mm | Good | Slidell in May |
| June | 32° / 24° | 13 | 17 | 0 | 151 mm | Ok | Slidell in June |
| July | 32° / 25° | 18 | 13 | 0 | 173 mm | Ok | Slidell in July |
| August | 32° / 25° | 20 | 11 | 0 | 244 mm | Ok | Slidell in August |
| September | 30° / 23° | 12 | 18 | 0 | 142 mm | Ok | Slidell in September |
| October | 26° / 18° | 6 | 25 | 0 | 85 mm | Perfect | Slidell in October |
| November | 20° / 12° | 4 | 26 | 0 | 78 mm | Good | Slidell in November |
| December | 17° / 10° | 7 | 24 | 0 | 126 mm | Ok | Slidell in December |