Grand Isle, LA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for Grand Isle, LA.

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Current Conditions — Grand Isle, LA

GALLIANO (KGAO)

Partly Cloudy

81.9 F
Humidity:68%
Wind Speed: 12.8 G 18.3 mph
Barometer:30.01 in
Dewpoint:70.3 F
Visibility:10.00 mi
Precip:--
Heat Index:85.8 F
Wind Chill:NA
Apr 27 2026, 11:35 AM CDT
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5-Day Forecast — Grand Isle, LA

Monday

High 78 °F
Partly Sunny
Monday
Night
Low 73 °F
Partly Cloudy
Tuesday

High 78 °F
Partly Sunny
Tuesday
Night
Low 73 °F
Mostly Cloudy
Wednesday

High 78 °F
Partly Sunny
Wednesday
Night
Low 73 °F
Mostly Cloudy
Thursday

High 78 °F
Isolated T-storm
Thursday
Night
Low 71 °F
Slight Chance of Rain
Friday

High 77 °F
Slight Chance of Rain Showers

Detailed Forecast — Grand Isle, LA

Monday
Partly Sunny. High near 78°F. Wind 12 to 13 mph, with gusts as high as 18 mph.
Monday Night
Partly Cloudy. Low around 73°F. Wind 10 to 13 mph, with gusts as high as 17 mph.
Tuesday
Partly Sunny. High near 78°F. Wind 9 to 12 mph, with gusts as high as 18 mph.
Tuesday Night
Mostly Cloudy. Low around 73°F. Wind 10 to 12 mph, with gusts as high as 16 mph.
Wednesday
Partly Sunny. High near 78°F. Wind 7 to 9 mph, with gusts as high as 15 mph.
Wednesday Night
Mostly Cloudy. Low around 73°F. Wind around 8 mph, with gusts as high as 12 mph.
Thursday
Isolated T-storm. High near 78°F. Wind 8 to 12 mph, with gusts as high as 13 mph.
Thursday Night
Slight Chance of Rain. Low around 71°F. Wind around 14 mph, with gusts as high as 16 mph.
Friday
Slight Chance of Rain Showers. High near 77°F. Wind 18 to 20 mph, with gusts as high as 25 mph.
Friday Night
Thunderstorms Likely. Low around 68°F. Wind around 22 mph, with gusts as high as 25 mph.
Saturday
Chance of Thunderstorms. High near 75°F. Wind 20 to 21 mph, with gusts as high as 26 mph.
Saturday Night
Chance of Thunderstorms. Low around 64°F. Wind around 20 mph, with gusts as high as 23 mph.
Sunday
Isolated T-storm. High near 73°F. Wind 10 to 15 mph, with gusts as high as 21 mph.
LA Radar
Current Radar • LA
Day 1 Outlook • April 27, 2026

Observation History — Grand Isle, LA

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
11:35 AM CDT 12.8 G 18.3 10.00 Partly Cloudy -- 81.9 70.3 68% NA 85.8 30.01 1016.3
11:15 AM CDT 10.3 G 16.1 10.00 Partly Cloudy -- 81.5 70.5 69% NA 85.5 30.01 1016.3
10:55 AM CDT 11.4 G 17.2 10.00 Partly Cloudy -- 81.1 71.1 72% NA 85.1 30.00 1015.9
10:35 AM CDT 10.3 G 16.1 10.00 Partly Cloudy -- 80.8 71.2 73% NA 84.7 30.00 1015.9
10:15 AM CDT 10.3 G 17.2 10.00 Partly Cloudy -- 80.2 71.6 75% NA 84.0 29.99 1015.6
09:55 AM CDT 12.8 G 17.2 10.00 Mostly Cloudy -- 79.3 71.1 76% NA 82.4 29.99 1015.6
09:35 AM CDT SE 8.1 10.00 Partly Cloudy -- 78.4 71.1 78% NA 79.7 29.99 1015.6
09:15 AM CDT 10.3 G 17.2 10.00 Mostly Cloudy -- 78.4 70.9 78% NA 79.7 29.98 1015.2
08:55 AM CDT 10.3 10.00 Mostly Cloudy -- 78.1 70.9 79% NA 79.3 29.97 1014.9
08:35 AM CDT 9.2 10.00 Partly Cloudy -- 77.5 70.7 80% NA 78.8 29.97 1014.9
08:15 AM CDT 8.1 10.00 Partly Cloudy -- 76.3 70.0 81% NA 77.4 29.97 1014.9
07:55 AM CDT 9.2 10.00 Mostly Cloudy -- 76.6 70.7 82% NA 77.9 29.96 1014.6
07:35 AM CDT 8.1 10.00 Cloudy -- 75.7 70.7 84% NA 77.0 29.96 1014.6
07:15 AM CDT 8.1 10.00 Cloudy -- 75.4 70.9 86% NA 76.6 29.95 1014.2
06:55 AM CDT 8.1 10.00 Mostly Cloudy -- 74.7 70.9 88% NA 75.9 29.94 1013.9
06:35 AM CDT SE 5.8 10.00 Cloudy -- 74.5 70.7 88% NA 75.7 29.94 1013.9
06:15 AM CDT SE 4.7 10.00 Cloudy -- 74.7 70.7 87% NA 75.9 29.94 1013.6
05:55 AM CDT SE 5.8 10.00 Cloudy -- 75.2 70.7 86% NA 76.5 29.92 1013.2
05:35 AM CDT SE 5.8 10.00 Mostly Cloudy -- 75.2 70.7 86% NA 76.5 29.92 1013.2
05:15 AM CDT 4.7 10.00 Mostly Cloudy -- 75.2 70.7 86% NA 76.5 29.92 1013.2
04:55 AM CDT 5.8 10.00 Mostly Cloudy -- 75.0 70.3 85% NA 76.3 29.91 1012.9
04:35 AM CDT 8.1 10.00 Mostly Cloudy -- 75.0 70.5 86% NA 76.3 29.91 1012.9
04:15 AM CDT 8.1 10.00 Mostly Cloudy -- 75.2 70.7 86% NA 76.5 29.90 1012.5
03:55 AM CDT 6.9 10.00 Cloudy -- 74.8 70.7 87% NA 76.1 29.91 1012.9

Regional Weather Observation

GALLIANO (KGAO)

Partly Cloudy
81.9 F

NEW ORLEANS NAS (KNBG)

Mostly Cloudy
82.9 F

HOUMA TERREBONNE (KHUM)

Mostly Clear
82.4 F

(KLNQ)


F

NEW ORLEANS/INTL (KMSY)

Clear
84.2 F

NEW ORLEANS/LAKE (KNEW)

Clear
86.0 F
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