Grand Isle, LA
Full City Profile · Louisiana · Jefferson Parish County
2.9
/5.0
C+
Fair
644
Population
101/sq mi density
$266,100
Home Value
$261,556 Zillow
$1,118
Median Rent
18.7% income on rent
69°F
Avg Temperature
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
C+
Education
2.9 / 5.0
23.7% bachelor's degree or higher
Grand Isle enjoys a temperate climate with an average annual temperature of 69°F (21°C). Winters average 54°F in January while summers reach 82°F in July. Annual precipitation totals 62.4 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 46.
Temperature
54°F Jan (12°C)
82°F Jul (28°C)
| Annual Average | 69.4°F |
| 29% above US avg | |
| January Average | 54°F (12°C) |
| July Average | 82°F (28°C) |
Geography
| Elevation | 2 ft (1 m) |
| Area | 8.2 sq mi (21.2 km²) |
| Population Density | 101/sq mi |
| Coordinates | 29.2129°N, 90.0291°W |
| Timezone | America/Chicago |
| County | Jefferson Parish County |
| Nearest Airport | Louis Armstrong New Orleans International (MSY) 56 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 46.0 |
| Rating | Good |
| Good Days % | 61.2% |
| Unhealthy Days | 1 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0448 ppm |
| NO₂ (Nitrogen Dioxide) | 10.1 ppb |
| PM2.5 (Fine Particles) | 8.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.7 / 100 |
| Social Vulnerability | 68.4 / 100 |
| Community Resilience | 97.7 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | Very High |
| Earthquake | Relatively Low |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Relatively High |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Very High |
| Ice Storm | Relatively High |
| Drought | Relatively Low |
| Cold Wave | Relatively High |
| Landslide | Very Low |
| Coastal Flood | Very High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 54°F (12°C) | 5.9 in | Coldest |
| February | 57°F (14°C) | 3.8 in | |
| March | 63°F (17°C) | 4.9 in | |
| April | 69°F (20°C) | 3.9 in | |
| May | 76°F (24°C) | 3.5 in | |
| June | 81°F (27°C) | 6.2 in | |
| July | 82°F (28°C) | 8.0 in | Wettest |
| August | 83°F (28°C) | 7.5 in | Warmest |
| September | 79°F (26°C) | 6.3 in | |
| October | 71°F (22°C) | 4.2 in | |
| November | 62°F (17°C) | 3.3 in | Driest |
| December | 56°F (13°C) | 4.9 in |
Grand Isle has a seasonal temperature swing of 29°F / from 54°F in January to 83°F in August. Total annual precipitation is 62.4 inches, with July being the wettest month (8.0") and November the driest (3.3").