Grand Isle, LA weather
Today, hourly and 7-day forecast, sunrise and sunset, and the normal climate month by month
Weather in Grand Isle now
Loading the National Weather Service forecast…
Grand Isle weather by the hour
Grand Isle weather for the next 7 days
Source: National Weather Service (NOAA) · forecast for the coordinates of Grand Isle.
This week in Grand Isle
Sunrise, sunset and moon in Grand Isle
What is the weather usually like in Grand Isle?
Köppen climate classification, calculated from the 1991–2020 normals
- Augustwarmest month · 89°F average high
- Januarycoldest month · 45°F average low
- 66.7 inprecipitation per year · 1,694 mm
Average high and low temperature (°F)
Average precipitation (inches)
Best time to visit Grand Isle: March–April and October–November, with mild temperatures and fewer rainy days.
Source: NOAA NCEI U.S. Climate Normals 1991–2020, station GALLIANO, LA US (USC00163433), adjusted for the elevation of Grand Isle.
Grand Isle weather month by month
Sunrise and sunset in Grand Isle through the year
| Month | Sunrise | Sunset | Daylight |
|---|---|---|---|
| January | 6:53 AM | 5:25 PM | 10 h 31 min |
| February | 6:37 AM | 5:50 PM | 11 h 13 min |
| March | 7:08 AM | 7:09 PM | 12 h 1 min |
| April | 6:32 AM | 7:27 PM | 12 h 55 min |
| May | 6:06 AM | 7:46 PM | 13 h 39 min |
| June | 5:59 AM | 8:02 PM | 14 h 2 min |
| July | 6:09 AM | 8:02 PM | 13 h 52 min |
| August | 6:27 AM | 7:41 PM | 13 h 13 min |
| September | 6:43 AM | 7:06 PM | 12 h 22 min |
| October | 7:00 AM | 6:31 PM | 11 h 30 min |
| November | 6:22 AM | 5:06 PM | 10 h 43 min |
| December | 6:45 AM | 5:05 PM | 10 h 19 min |
Times for the 15th of each month, local time (America/Chicago).
What is the weather like in Grand Isle?
Grand Isle has a humid subtropical climate. The warmest month is August, with an average high of 89°F (32°C), and the coldest is January, with average lows of 45°F (7°C).
It gets about 66.7 inches (1,694 mm) of precipitation a year. The wettest month is July and the driest is November.
The best time to visit Grand Isle is March–April and October–November. At 7 ft of elevation, nights are mild most of the year. The live forecast on this page comes from the National Weather Service and the climate averages from NOAA’s 1991–2020 U.S. Climate Normals.
More about Grand Isle
Weather in towns near Grand Isle
Questions about the weather in Grand Isle
What is the hottest month in Grand Isle?
August, with an average high of 89°F (32°C).
What is the coldest month in Grand Isle?
January, with an average low of 45°F (7°C).
How much does it rain in Grand Isle?
About 66.7 inches (1,694 mm) a year; the wettest month is July.
Does it snow in Grand Isle?
Snow is very rare or not recorded at the nearest weather station.
When is the best time to visit Grand Isle?
March–April and October–November, when temperatures are most pleasant and rainy days are fewer.
What climate does Grand Isle have?
Humid subtropical (Köppen Cfa).
What is the weather like in Grand Isle in November?
Highs average 71°F and lows 52°F, with about 3.5 inches of precipitation.
What time is sunrise in Grand Isle?
Around 6:22 AM in mid-November, and sunset around 5:06 PM. Today’s exact times are shown above.
Where does this Grand Isle weather forecast come from?
From the National Weather Service (NOAA), the official U.S. weather agency, for the exact coordinates of Grand Isle.
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