TODAY AUG14
TEMPERATURE83
HUMIDITY77
PRESSURE30.04
WIND COND.330 4.7
  • 8782Wed20%30%
  • 8782Thu20%50%
  • 8782Fri30%30%
  • 8782Sat
  • 8882Sun
daynightWeather update from Galliano, South Lafourche Airport at

Grand Isle Average Weather

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"

Did you know?

  • The highest monthly average temperature in Grand Isle for August is 81 degrees.
  • The lowest monthly average temperature in Grand Isle for January is 54 degrees.
  • The most monthly precipitation in Grand Isle occurs in May with 17.5 inches.
  • The air quality index in Grand Isle is 31% better than the national average.
  • The pollution index in Grand Isle is 23% better than the national average.

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Compare Grand Isle, LA Weather To Other Cities

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 index3410650
Pollution index3,881,7302,540,2835,066,862

Grand Isle air quality information

MeasurementTotal
Days measured365
Days with good air quality332
Days with moderate air quality32
Days w/ poor A.Q. for sensitive groups1
Days with unhealthy air quality

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

City, StatePopulationAir Quality IndexNational Avg.
Grand Isle, LA8123432%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Dubois, WY8124020%
Sharpsville, IN8124216%
Grawn, MI8123628%
Wessington Springs, SD8123530%
Paw Paw, IL812198%
Grand Isle, LA8123432%
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.