TODAY MAR19
TEMPERATURE
HUMIDITY
PRESSURE
WIND COND.
  • 6055Tue
  • 6662Wed
  • 6862Thu20%50%
  • 6961Fri40%
  • 6963Sat
daynightWeather update from Galliano, South Lafourche Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Grand Isle for August is 81.4 degrees
  • The lowest monthly average temperature in Grand Isle for January is 54.1 degrees
  • The most monthly precipitation in Grand Isle occurs in May with 17.5 inches
  • The air quality index in Grand Isle is 3% better than the national average
  • The pollution index in Grand Isle is 42% worse than the national average

Compare Grand Isle, LA Weather

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      Grand Isle Average Temperature

      In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
      MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
      January46°F65°F54°F11.3"
      February48°F67°F57°F5.8"
      March54°F74°F64°F7.3"
      April60°F79°F70°F11.7"
      May66°F85°F75°F17.5"
      June72°F90°F81°F8.4"
      July74°F91°F81°F8.4"
      August74°F90°F81°F12.8"
      September71°F88°F79°F10.6"
      October61°F81°F71°F10.7"
      November52°F73°F61°F11.5"
      December49°F67°F57°F9.8"

      Grand Isle air quality index & pollution index

      In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
      IndexGrand IsleLouisianaNational
      Air quality index4110642
      Pollution index3,881,7302,526,4752,726,193

      Grand Isle air quality information

      MeasurementTotal
      Days measured361
      Days with good air quality272
      Days with moderate air quality87
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Grand Isle air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.040%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.000%

      Average monthly Grand Isle temperature with heat index

      Grand Isle monthly precipitation with daily maximum

      Grand Isle monthly snow depth with daily maximum

      Grand Isle monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Grand Isle, LA6724118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Grafton, IL672548.0%
      Seneca Gardens, KY672492.0%
      Campbell, NY6723530.0%
      Nelsonville, NY6723628.0%
      Garibaldi, OR6721864.0%
      Grand Isle, LA6724118.0%
      Source: The Grand Isle, LA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.