What should you know about Slidell's weather?
- NWS office
- New Orleans/Baton Rouge (LIX)
- Climate
- Humid subtropical
- Time zone
- CST/CDT
- Elevation
- 6 ft
- Coordinates
- 30.28° N, 89.78° W
- Nearest radar
- KHDC · Hammond NEXRAD · 41 mi
- County
- St. Tammany Parish, LA
- Yearly rain
- 61.9 in
- Warmest month
- July · 82.1°F average
- Coldest month
- January · 51.4°F average
- Severe storm peak
- Apr to Jun
How much rain does Slidell get each month?
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| High °F | 62.0 | 65.9 | 71.8 | 77.9 | 84.9 | 89.7 | 91.1 | 91.2 | 88.0 | 80.5 | 71.0 | 64.3 |
| Low °F | 40.7 | 44.4 | 50.0 | 56.1 | 63.8 | 70.9 | 73.1 | 72.9 | 68.5 | 57.4 | 46.7 | 42.8 |
| Rain (in) | 5.57 | 4.14 | 4.94 | 5.21 | 5.46 | 6.11 | 7.25 | 6.96 | 4.14 | 3.72 | 3.89 | 4.49 |
| Month | High °F | Low °F | Rain (in) |
|---|---|---|---|
| Jan | 62.0 | 40.7 | 5.57 |
| Feb | 65.9 | 44.4 | 4.14 |
| Mar | 71.8 | 50.0 | 4.94 |
| Apr | 77.9 | 56.1 | 5.21 |
| May | 84.9 | 63.8 | 5.46 |
| Jun | 89.7 | 70.9 | 6.11 |
| Jul | 91.1 | 73.1 | 7.25 |
| Aug | 91.2 | 72.9 | 6.96 |
| Sep | 88.0 | 68.5 | 4.14 |
| Oct | 80.5 | 57.4 | 3.72 |
| Nov | 71.0 | 46.7 | 3.89 |
| Dec | 64.3 | 42.8 | 4.49 |
SLIDELL AP, LA US · 5 mi away · NOAA NCEI U.S. Climate Normals 1991 to 2020
What can Slidell weather radar tell me about storms near Old Spanish Trail?
It can show an approaching storm, but the rain colors alone do not establish its damage potential. The South Slidell tornado survey places the worst damage along Old Spanish Trail. The same track damaged businesses on Pontchartrain Drive and continued through the Fremaux area. Treat an official tornado warning as the instruction to shelter instead of waiting for an obvious hook on the loop.
Why is the northern Slidell tornado track a separate concern?
The North Slidell survey confirmed another tornado affecting neighborhoods along Crawford Landing Road. Investigators combined ground surveys, radar imagery and high-resolution satellite analysis to identify that track. They also documented widespread tree damage along Country Club Blvd. A severe line can therefore affect separate neighborhoods through different circulations, so keep following warnings after a nearby storm moves past.
Can Slidell flood from a hurricane even when the heaviest rain moves away?
Yes, storm surge is a separate source of flooding from the rain shown on this page. The final Hurricane Ida account says surge pushed water into some homes and cut off low-lying portions of Slidell. That impact cannot be assessed by measuring the distance to a bright rain echo. Use official coastal flood information and local road reports before returning to waterfront areas.
Why is the station labeled Hammond when I am looking at Slidell?
The closest NEXRAD station is now KHDC in Hammond, about 41 miles from Slidell. The National Weather Service moved the former Slidell radar and renamed it KHDC. Radar samples progressively higher above its location with increasing distance. Keep that limitation in mind when a shallow storm feature is difficult to pick out, and use NWS New Orleans/Baton Rouge warnings for the official assessment.
When should you check the Slidell radar?
Spring severe weather
April to JuneBefore visiting Heritage Park, check whether a storm line is gaining ground toward the picnic areas. Move into a substantial building or enclosed vehicle if thunder interrupts the outing.
Tropical activity peak
Mid-August to mid-OctoberAt Slidell Municipal Marina, use the first approaching rain bands as a cue to reassess wind forecasts and complete preparations. The loop cannot tell boaters how high the water will rise at the docks.
What else do people ask about the Slidell radar?
Which NWS office and radar cover Slidell?
NWS New Orleans/Baton Rouge (LIX) issues forecasts and warnings for Slidell. The nearest NEXRAD radar is KHDC, about 41 miles from the city center.
How often does the radar on this page update?
The radar loop on this page updates every 5 minutes.
Is this page an official warning service?
No. It shows radar and forecasts only. For warnings, follow NWS New Orleans/Baton Rouge and local emergency alerts.
Quick facts
- Radar: KHDC (Hammond NEXRAD), a new frame every 5 minutes
- Forecasts and warnings: NWS New Orleans/Baton Rouge (LIX)
- Severe storms peak from April to June (NOAA Storm Events, 1996 to 2025)
- Local time: CST/CDT
- Radar: KHDC, a new frame every 5 minutes
- Warnings: NWS New Orleans/Baton Rouge (LIX)
- Severe storms: April to June
- Local time: CST/CDT
Where does this data come from?
- NOAA NEXRAD radar via Iowa Environmental Mesonet
- National Weather Service, New Orleans/Baton Rouge office
- NOAA NCEI U.S. Climate Normals 1991 to 2020: SLIDELL AP, LA US
- NOAA NCEI Storm Events Database, 1996 to 2025
- USGS Elevation Point Query Service
- GOES-East satellite imagery
- Open-Meteo forecast API
- OpenStreetMap contributors
- NWS New Orleans/Baton Rouge: South Slidell tornado survey
- NWS New Orleans/Baton Rouge: North Slidell tornado survey
- NWS New Orleans/Baton Rouge: Final Hurricane Ida parish impacts
- National Weather Service: Hammond radar service change
- National Weather Service: Doppler radar interpretation
- EPA: Bayou Bonfouca park and marina redevelopment
- National Hurricane Center: Tropical cyclone climatology