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Weather & Climate in Slidell, LA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Slidell enjoys a temperate climate with an average annual temperature of 68°F (20°C). Winters average 51°F in January while summers reach 82°F in July. The area gets 313 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 66.2 inches (wetter than the 38-inch national average). Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 10 feet.
Temperature
51°F Jan (11°C)
82°F Jul (28°C)
| Annual Average | 67.6°F |
| 25% above US avg | |
| January Average | 51°F (11°C) |
| July Average | 82°F (28°C) |
| Sunny Days | 313 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 0.3 sq mi (0.9 km²) |
| Population Density | 1,885/sq mi |
| Coordinates | 30.2889°N, 89.7829°W |
| Timezone | America/Chicago |
| County | St. Tammany Parish County |
| Nearest Airport | Louis Armstrong New Orleans International (MSY) 35 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.6 / 100 |
| Social Vulnerability | 34.0 / 100 |
| Community Resilience | 93.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively High |
| Ice Storm | Relatively Moderate |
| Drought | Relatively Moderate |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
1 earthquake (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.0.
| Aug 2, 2010 | 16 km ESE of Clinton, Louisiana | M3.0 | 118 km | 0 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
24 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Francine | Category 2 | 104 mph | 132 km |
| 2021 | Ida | Category 4 | 150 mph | 89 km |
| 2020 | Zeta | Category 3 | 115 mph | 15 km |
| 2020 | Sally | Category 2 | 109 mph | 184 km |
| 2019 | Barry | Category 1 | 75 mph | 232 km |
| 2017 | Nate | Category 1 | 92 mph | 71 km |
| 2012 | Isaac | Category 1 | 81 mph | 121 km |
| 2009 | Ida | Category 1 | 86 mph | 225 km |
| 2008 | Gustav | Category 2 | 109 mph | 150 km |
| 2005 | Katrina | Category 4 | 144 mph | 18 km |
| 2005 | Dennis | Category 3 | 127 mph | 245 km |
| 2005 | Cindy | Category 1 | 75 mph | 125 km |
| 2004 | Ivan | Category 4 | 132 mph | 181 km |
| 2002 | Lili | Category 3 | 121 mph | 244 km |
| 1998 | Georges | Category 2 | 109 mph | 86 km |
| 1998 | Earl | Category 2 | 98 mph | 244 km |
| 1997 | Danny | Category 1 | 81 mph | 95 km |
| 1995 | Opal | Category 4 | 127 mph | 241 km |
| 1995 | Erin | Category 2 | 98 mph | 222 km |
| 1992 | Andrew | Category 4 | 144 mph | 178 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
613 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 42 fatalities, 695 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Apr 19, 2020 | EF4 | 89 km | 53.8 mi | 1 |
| Dec 6, 1983 | EF4 | 75 km | 7.0 mi | 0 |
| Oct 3, 1964 | EF4 | 95 km | 1.5 mi | 22 |
| Mar 22, 2022 | EF3 | 52 km | 11.5 mi | 1 |
| Feb 7, 2017 | EF3 | 37 km | 10.1 mi | 0 |
| Dec 25, 2012 | EF3 | 41 km | 60.3 mi | 0 |
| May 26, 2011 | EF3 | 44 km | 6.1 mi | 0 |
| Aug 25, 1992 | EF3 | 69 km | 9.0 mi | 2 |
| Mar 20, 1983 | EF3 | 79 km | 2.0 mi | 0 |
| May 19, 1980 | EF3 | 33 km | 13.1 mi | 0 |
| May 19, 1980 | EF3 | 59 km | 10.6 mi | 0 |
| May 16, 1980 | EF3 | 61 km | 11.5 mi | 0 |
| Apr 13, 1980 | EF3 | 66 km | 15.9 mi | 0 |
| Nov 3, 1968 | EF3 | 68 km | 2.0 mi | 0 |
| Oct 30, 1967 | EF3 | 68 km | 2.0 mi | 4 |
| Apr 18, 1966 | EF3 | 86 km | 23.8 mi | 0 |
| Jan 28, 1966 | EF3 | 66 km | 0.1 mi | 0 |
| Feb 6, 1953 | EF3 | 91 km | 15.6 mi | 2 |
| Apr 10, 2024 | EF2 | 5 km | 11.0 mi | 0 |
| Feb 8, 2023 | EF2 | 94 km | 3.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNNAMED (7,660 acres, 2013).
| Year | Name | Acres Burned | Distance |
| 2013 | UNNAMED | 7,660 | 97 km |
| 2010 | DESOTO 1057 | 7,148 | 98 km |
| 2010 | DESOTO 1064 | 5,695 | 96 km |
| 2014 | UNNAMED | 5,230 | 88 km |
| 2008 | UNNAMED | 5,097 | 89 km |
| 2008 | UNNAMED | 5,061 | 89 km |
| 2010 | DESOTO 1051 | 4,864 | 83 km |
| 2010 | DESOTO 1053 | 3,726 | 85 km |
| 2020 | DE SOTO - BB 9370 | 3,719 | 98 km |
| 2014 | UNNAMED | 3,646 | 91 km |
| 2006 | KILN (BAYOU BACON) | 3,576 | 31 km |
| 2010 | DESOTO 1052 | 3,428 | 86 km |
| 2014 | UNNAMED | 3,345 | 90 km |
| 2008 | UNNAMED | 3,325 | 93 km |
| 2006 | SANDY FOX FIRE | 3,167 | 55 km |
| 2014 | UNNAMED | 3,011 | 87 km |
| 2017 | UNNAMED | 2,914 | 83 km |
| 2020 | DE SOTO - BB 8366 AND 8374 | 2,691 | 84 km |
| 2013 | UNNAMED | 2,642 | 85 km |
| 2015 | UNNAMED | 2,576 | 92 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (11°C) | 5.4 in | Coldest |
| February | 54°F (12°C) | 5.5 in | |
| March | 61°F (16°C) | 5.7 in | |
| April | 67°F (19°C) | 4.5 in | |
| May | 74°F (24°C) | 4.9 in | |
| June | 80°F (27°C) | 4.8 in | |
| July | 82°F (28°C) | 6.3 in | Warmest, Wettest |
| August | 82°F (28°C) | 5.9 in | |
| September | 78°F (26°C) | 5.4 in | |
| October | 69°F (21°C) | 3.0 in | Driest |
| November | 60°F (16°C) | 4.4 in | |
| December | 54°F (12°C) | 5.4 in |
Slidell has a seasonal temperature swing of 31°F / from 51°F in January to 82°F in July. Total annual precipitation is 61.2 inches, with July being the wettest month (6.3") and October the driest (3.0").