Grand Isle, Louisiana 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 84°F 29°C Heat Index: 96°F	Observed at: Grand Isle, LA	Elevation: 18 ft | 5 m
	Last Updated: July 29, 5:15 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 84°F | 29°C
	Pressure: 29.88 in | 1011.9 mb	Dewpoint: 79°F | 26°C
	Humidity: 86%	Wind: WNW 14 mph | WNW 23 kph
	Feels Like: 91°F | 33°C	Visibility: 30.8 mi | 49.5 km
	Lat/Long: 29.24 | -89.98	Sunrise: 6:18 AM   Sunset: 7:53 PM

7 Day Graphical Forecast

Valid: 5:21 AM 7/29/2026

Tonight Overcast 84 °F 5% Chance Precipitation Thursday Overcast 88 |85 °F 10% Chance Precipitation Friday Overcast 90 |81 °F 16% Chance Precipitation Saturday Light Showers 91 |74 °F 36% Chance Precipitation Sunday Thunderstorm with Hail 90 |81 °F 79% Chance Precipitation Monday Light Showers 89 |76 °F 49% Chance Precipitation Tuesday Drizzle 91 |78 °F 27% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:21 AM 7/29/2026

5 AM Clear 84 °F 1% Chance Precipitation

6 AM Clear 84 °F 1% Chance Precipitation

7 AM Clear 84 °F 3% Chance Precipitation

8 AM Clear 84 °F 2% Chance Precipitation

9 AM Clear 84 °F 2% Chance Precipitation

10 AM Clear 85 °F 2% Chance Precipitation

11 AM Clear 87 °F 2% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for Grand Isle, LA - (Fahrenheit & Celsius) Valid: 5:21 AM 7/29/2026 Tonight Overcast with a low around 84°F [29°C]. W wind to around 19 mph [31 kph], with gusts to near 21 mph [34 kph]. Chance of precipitation 5% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 88°F [31°C]. WSW wind to around 22 mph [35 kph], with gusts to near 23 mph [37 kph]. Dewpoint near 79°F [26°C] with humidity of 80%. Pressure around 29.88 in [1011.9 mb]. UV Index: 8.5. Chance of precipitation 10% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 85°F [29°C]. WSW wind to around 22 mph [35 kph], with gusts to near 23 mph [37 kph]. Chance of precipitation 10% with QPF of 0.00 in [0.0 mm]. Friday Overcast with a high near 90°F [32°C]. WSW wind to around 16 mph [25 kph], with gusts to near 23 mph [36 kph]. Dewpoint near 79°F [26°C] with humidity of 77%. Pressure around 29.88 in [1011.9 mb]. UV Index: 8.45. Chance of precipitation 16% with QPF of 0.00 in [0.0 mm]. Friday Night Overcast with a low around 81°F [27°C]. WSW wind to around 16 mph [25 kph], with gusts to near 23 mph [36 kph]. Chance of precipitation 16% with QPF of 0.00 in [0.0 mm]. Saturday Light Showers with a high near 91°F [33°C]. WSW wind to around 22 mph [35 kph], with gusts to near 36 mph [57 kph]. Dewpoint near 79°F [26°C] with humidity of 95%. Pressure around 29.88 in [1011.9 mb]. UV Index: 7.2. Chance of precipitation 36% with QPF of 0.28 in [7.2 mm]. Saturday Night Light Showers with a low around 74°F [23°C]. WSW wind to around 22 mph [35 kph], with gusts to near 36 mph [57 kph]. Chance of precipitation 36% with QPF of 0.28 in [7.2 mm]. Sunday Thunderstorm with Hail with a high near 90°F [32°C]. WSW wind to around 21 mph [34 kph], with gusts to near 24 mph [38 kph]. Dewpoint near 79°F [26°C] with humidity of 83%. Pressure around 29.88 in [1011.9 mb]. UV Index: 7.3. Chance of precipitation 79% with QPF of 0.90 in [22.8 mm]. Sunday Night Thunderstorm with Hail with a low around 81°F [27°C]. WSW wind to around 21 mph [34 kph], with gusts to near 24 mph [38 kph]. Chance of precipitation 79% with QPF of 0.90 in [22.8 mm]. Monday Light Showers with a high near 89°F [32°C]. WSW wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Dewpoint near 79°F [26°C] with humidity of 91%. Pressure around 29.88 in [1011.9 mb]. UV Index: 6.6. Chance of precipitation 49% with QPF of 0.57 in [14.4 mm]. Monday Night Light Showers with a low around 76°F [24°C]. WSW wind to around 10 mph [17 kph], with gusts to near 18 mph [29 kph]. Chance of precipitation 49% with QPF of 0.57 in [14.4 mm]. Tuesday Drizzle with a high near 91°F [33°C]. SW wind to around 11 mph [18 kph], with gusts to near 13 mph [21 kph]. Dewpoint near 79°F [26°C] with humidity of 85%. Pressure around 29.88 in [1011.9 mb]. UV Index: 8.15. Chance of precipitation 27% with QPF of 0.13 in [3.3 mm]. Tuesday Night Drizzle with a low around 78°F [26°C]. SW wind to around 11 mph [18 kph], with gusts to near 13 mph [21 kph]. Chance of precipitation 27% with QPF of 0.13 in [3.3 mm].

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7 Day and Night - QPF Forecast for Grand Isle, LA

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 0.0 mm | 0.00 in

Friday Night: 0.0 mm | 0.00 in

Saturday: 7.2 mm | 0.28 in

Saturday Night: 7.2 mm | 0.28 in

Sunday: 22.8 mm | 0.90 in

Sunday Night: 22.8 mm | 0.90 in

Monday: 14.4 mm | 0.57 in

Monday Night: 14.4 mm | 0.57 in

Tuesday: 3.3 mm | 0.13 in

Tuesday Night: 3.3 mm | 0.13 in

7 Day and Night - Maximum Wind Speed Forecast for Grand Isle, LA

Tonight: W @ 31 kph | 19 mph

Thursday: WSW @ 35 kph | 22 mph

Thursday Night: WSW @ 35 kph | 22 mph

Friday: WSW @ 25 kph | 16 mph

Friday Night: WSW @ 25 kph | 16 mph

Saturday: WSW @ 35 kph | 22 mph

Saturday Night: WSW @ 35 kph | 22 mph

Sunday: WSW @ 34 kph | 21 mph

Sunday Night: WSW @ 34 kph | 21 mph

Monday: WSW @ 17 kph | 10 mph

Monday Night: WSW @ 17 kph | 10 mph

Tuesday: SW @ 18 kph | 11 mph

Tuesday Night: SW @ 18 kph | 11 mph

7 Day and Night - Maximum Humidity Forecast for Grand Isle, LA

Tonight: 87 %

Thursday: 80 %

Thursday Night: 80 %

Friday: 77 %

Friday Night: 77 %

Saturday: 95 %

Saturday Night: 95 %

Sunday: 83 %

Sunday Night: 83 %

Monday: 91 %

Monday Night: 91 %

Tuesday: 85 %

Tuesday Night: 85 %

7 Day and Night - Snowfall Totals Forecast for Grand Isle, LA

Tonight: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

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