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Weather & Climate in Port Sulphur, LA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Port Sulphur enjoys a temperate climate with an average annual temperature of 70°F (21°C). Winters average 55°F in January while summers reach 83°F in July. The area gets 317 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 63.9 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 -3 feet.
Temperature
55°F Jan (13°C)
83°F Jul (28°C)
| Annual Average | 69.9°F |
| 29% above US avg | |
| January Average | 55°F (13°C) |
| July Average | 83°F (28°C) |
| Sunny Days | 317 days/yr |
Geography
| Elevation | -3 ft (-1 m) |
| Area | 8.5 sq mi (21.9 km²) |
| Population Density | 283/sq mi |
| Coordinates | 29.5045°N, 89.7220°W |
| Timezone | America/Chicago |
| County | Plaquemines Parish County |
| Nearest Airport | Louis Armstrong New Orleans International (MSY) 47 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 72.9 / 100 |
| Social Vulnerability | 59.5 / 100 |
| Community Resilience | 97.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively High |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Very Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively Moderate |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
| Coastal Flood | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
2 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Mar 16, 2001 | 106 km SSE of Venice, Louisiana | M3.6 | 144 km | 10 km |
| Oct 18, 1997 | 69 km SSW of Dauphin Island, Alabama | M2.9 | 133 km | 1 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 5.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Francine | Category 2 | 104 mph | 114 km |
| 2021 | Ida | Category 4 | 150 mph | 65 km |
| 2020 | Zeta | Category 3 | 115 mph | 79 km |
| 2020 | Sally | Category 2 | 109 mph | 157 km |
| 2019 | Barry | Category 1 | 75 mph | 212 km |
| 2017 | Nate | Category 1 | 92 mph | 67 km |
| 2012 | Isaac | Category 1 | 81 mph | 52 km |
| 2009 | Ida | Category 1 | 86 mph | 150 km |
| 2008 | Gustav | Category 2 | 109 mph | 96 km |
| 2005 | Katrina | Category 5 | 161 mph | 12 km |
| 2005 | Dennis | Category 3 | 127 mph | 272 km |
| 2005 | Cindy | Category 1 | 75 mph | 50 km |
| 2004 | Ivan | Category 4 | 132 mph | 162 km |
| 2002 | Lili | Category 4 | 121 mph | 226 km |
| 1998 | Georges | Category 2 | 109 mph | 104 km |
| 1998 | Earl | Category 2 | 98 mph | 161 km |
| 1997 | Danny | Category 1 | 81 mph | 23 km |
| 1995 | Opal | Category 4 | 150 mph | 204 km |
| 1995 | Erin | Category 2 | 98 mph | 246 km |
| 1992 | Andrew | Category 4 | 144 mph | 135 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
266 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 32 fatalities, 492 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Dec 6, 1983 | EF4 | 99 km | 7.0 mi | 0 |
| Oct 3, 1964 | EF4 | 64 km | 1.5 mi | 22 |
| Mar 22, 2022 | EF3 | 53 km | 11.5 mi | 1 |
| Feb 7, 2017 | EF3 | 62 km | 10.1 mi | 0 |
| Aug 25, 1992 | EF3 | 94 km | 9.0 mi | 2 |
| May 19, 1980 | EF3 | 85 km | 13.1 mi | 0 |
| Jan 28, 1966 | EF3 | 74 km | 0.1 mi | 0 |
| Mar 21, 1957 | EF3 | 85 km | 2.0 mi | 0 |
| Apr 10, 2024 | EF2 | 84 km | 11.0 mi | 0 |
| Dec 14, 2022 | EF2 | 57 km | 10.6 mi | 0 |
| Dec 14, 2022 | EF2 | 93 km | 4.7 mi | 1 |
| Feb 23, 2016 | EF2 | 99 km | 4.7 mi | 0 |
| Mar 9, 2011 | EF2 | 88 km | 1.9 mi | 0 |
| Feb 13, 2007 | EF2 | 65 km | 1.3 mi | 1 |
| Feb 13, 2007 | EF2 | 59 km | 8.7 mi | 0 |
| Feb 2, 2006 | EF2 | 67 km | 5.5 mi | 0 |
| Apr 6, 2005 | EF2 | 65 km | 2.0 mi | 0 |
| Nov 24, 2004 | EF2 | 89 km | 4.0 mi | 0 |
| Mar 15, 2000 | EF2 | 97 km | 3.0 mi | 0 |
| Sep 10, 1998 | EF2 | 61 km | 4.0 mi | 1 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: UNIT 1 B (2,030 acres, 2000).
| Year | Name | Acres Burned | Distance |
| 2000 | UNIT 1 B | 2,030 | 70 km |
| 1998 | UNIT 4 CD | 1,729 | 93 km |
| 2015 | BAYOU LACROIX | 1,714 | 95 km |
| 2009 | SLIDELL AIRPORT | 1,663 | 97 km |
| 1998 | UNIT 7 | 1,623 | 88 km |
| 2011 | BAD ROMANCE | 1,305 | 64 km |
| 2011 | TONEY ISLAND | 1,215 | 96 km |
| 2004 | UNITS 1A-1B | 1,108 | 70 km |
| 2001 | UNNAMED | 950 | 99 km |
| 2010 | UNNAMED | 904 | 84 km |
| 2009 | GOOSEPOINT C | 864 | 91 km |
| 1996 | 1 B | 846 | 69 km |
| 2006 | BOY SCOUT EAST | 826 | 88 km |
| 2006 | UNNAMED | 823 | 99 km |
| 1998 | UNIT 2 A | 821 | 69 km |
| 1997 | 1 A | 797 | 71 km |
| 2000 | UNNAMED | 750 | 98 km |
| 2006 | UNNAMED | 717 | 86 km |
| 2005 | UNT 4A SAMMY SLOUGH | 717 | 91 km |
| 2009 | BAPTISTE CEMETERY | 684 | 99 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 55°F (13°C) | 5.0 in | Coldest |
| February | 56°F (13°C) | 5.3 in | |
| March | 62°F (16°C) | 5.0 in | |
| April | 68°F (20°C) | 4.1 in | |
| May | 75°F (24°C) | 5.0 in | |
| June | 80°F (27°C) | 4.8 in | |
| July | 83°F (28°C) | 6.8 in | Warmest, Wettest |
| August | 82°F (28°C) | 6.7 in | |
| September | 80°F (26°C) | 6.0 in | |
| October | 71°F (22°C) | 3.4 in | Driest |
| November | 63°F (17°C) | 4.5 in | |
| December | 57°F (14°C) | 5.2 in |
Port Sulphur has a seasonal temperature swing of 28°F / from 55°F in January to 83°F in July. Total annual precipitation is 61.6 inches, with July being the wettest month (6.8") and October the driest (3.4").