Grand Isle, LA Weather Forecast & Alerts

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

0 Currently Active Alerts for Grand Isle

✅
No active weather alerts for Grand Isle at this time.
Subscribe to receive instant notifications when alerts are issued.

Current Conditions — Grand Isle, LA

GALLIANO (KGAO)

Clear

68.0 F
Humidity:84%
Wind Speed: 0.0 mph
Barometer:30.01 in
Dewpoint:63.0 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 23 2026, 05:15 AM CDT
Severe Weather Alerts
Severe Weather
 		Daily Weather Forecast
Daily Forecast
 		Observation Alert Monitoring
Observations
 		Storm Report Monitoring
Storm Reports

5-Day Forecast — Grand Isle, LA

Thursday

High 77 °F
Partly Sunny
Thursday
Night
Low 71 °F
Mostly Cloudy
Friday

High 77 °F
Isolated T-storm
Friday
Night
Low 73 °F
Mostly Cloudy
Saturday

High 77 °F
Chance of T-storms
Saturday
Night
Low 73 °F
Partly Cloudy
Sunday

High 78 °F
Partly Sunny
Sunday
Night
Low 75 °F
Partly Cloudy
Monday

High 80 °F
Partly Sunny

Detailed Forecast — Grand Isle, LA

Thursday
Partly Sunny. High near 77°F. Wind 12 to 13 mph, with gusts as high as 18 mph.
Thursday Night
Mostly Cloudy. Low around 71°F. Wind 10 to 13 mph, with gusts as high as 17 mph.
Friday
Isolated T-storm. High near 77°F. Wind 8 to 10 mph, with gusts as high as 15 mph.
Friday Night
Mostly Cloudy. Low around 73°F. Wind 7 to 8 mph, with gusts as high as 12 mph.
Saturday
Chance of Thunderstorms. High near 77°F. Wind 6 to 8 mph, with gusts as high as 14 mph.
Saturday Night
Partly Cloudy. Low around 73°F. Wind around 3 mph, with gusts as high as 7 mph.
Sunday
Partly Sunny. High near 78°F. Wind 7 to 8 mph, with gusts as high as 13 mph.
Sunday Night
Partly Cloudy. Low around 75°F. Wind around 9 mph, with gusts as high as 14 mph.
Monday
Partly Sunny. High near 80°F. Wind 10 to 12 mph, with gusts as high as 20 mph.
Monday Night
Partly Cloudy. Low around 75°F. Wind around 10 mph, with gusts as high as 16 mph.
Tuesday
Partly Sunny. High near 80°F. Wind around 8 mph, with gusts as high as 13 mph.
Tuesday Night
Mostly Cloudy. Low around 73°F. Wind around 6 mph, with gusts as high as 9 mph.
Wednesday
Partly Sunny. High near 80°F. Wind 9 to 10 mph, with gusts as high as 16 mph.
LA Radar
Current Radar • LA
Day 1 Outlook • April 23, 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)
05:15 AM CDT 0.0 10.00 Clear -- 68.0 63.0 84% NA NA 30.01 1016.3
04:55 AM CDT 0.0 10.00 Clear -- 68.2 63.0 83% NA NA 30.01 1016.3
04:35 AM CDT 0.0 10.00 Clear -- 68.4 63.0 83% NA NA 30.01 1016.3
04:15 AM CDT 3.4 10.00 Clear -- 68.9 62.8 81% NA NA 30.01 1016.3
03:55 AM CDT 3.4 10.00 Clear -- 68.9 62.6 80% NA NA 30.01 1016.3
03:35 AM CDT SE 3.4 10.00 Clear -- 68.9 62.6 80% NA NA 30.01 1016.3
03:15 AM CDT 3.4 10.00 Clear -- 69.1 62.2 79% NA NA 30.01 1016.3
02:55 AM CDT SE 3.4 10.00 Clear -- 69.3 61.7 77% NA NA 30.01 1016.3
02:35 AM CDT 4.7 10.00 Clear -- 69.8 61.7 75% NA NA 30.02 1016.6
02:15 AM CDT 4.7 10.00 Clear -- 69.8 61.3 75% NA NA 30.02 1016.6
01:55 AM CDT 4.7 10.00 Clear -- 70.2 61.3 74% NA 70.3 30.03 1016.9
01:35 AM CDT 4.7 10.00 Clear -- 70.2 61.3 74% NA 70.3 30.03 1016.9
01:15 AM CDT SE 6.9 10.00 Clear -- 70.7 61.3 72% NA 70.9 30.04 1017.3
12:55 AM CDT SE 8.1 10.00 Clear -- 70.7 61.7 73% NA 70.9 30.04 1017.3
12:35 AM CDT SE 5.8 10.00 Clear -- 70.7 61.7 73% NA 70.9 30.05 1017.6
11:55 PM CDT 5.8 10.00 Clear -- 70.7 60.1 69% NA 70.7 30.05 1017.6
11:35 PM CDT 5.8 10.00 Clear -- 70.7 60.1 69% NA 70.7 30.05 1017.6
11:15 PM CDT SE 4.7 10.00 NULL -- 70.7 61.2 72% NA 70.9 30.07 1018.3
10:55 PM CDT SE 3.4 10.00 Clear -- 70.9 61.3 72% NA 71.1 30.07 1018.3
10:35 PM CDT SE 4.7 10.00 Clear -- 71.1 61.7 72% NA 71.2 30.07 1018.3
10:15 PM CDT 10.00 NULL -- NULL % NA NA M
09:55 PM CDT SE 4.7 10.00 Clear -- 71.2 62.6 74% NA 71.6 30.07 1018.3
09:35 PM CDT SE 4.7 10.00 Clear -- 71.6 62.6 73% NA 72.0 30.07 1018.3
09:15 PM CDT SE 4.7 10.00 Clear -- 71.8 63.0 74% NA 72.1 30.07 1018.3

Regional Weather Observation

GALLIANO (KGAO)

Clear
68.0 F

NEW ORLEANS NAS (KNBG)

Clear
60.1 F

HOUMA TERREBONNE (KHUM)

Clear
75.2 F

(KLNQ)


F

NEW ORLEANS/INTL (KMSY)

Mostly Clear
66.2 F

NEW ORLEANS/LAKE (KNEW)

Clear
66.2 F
🔔    Sign-up to receive daily weather forecasts by email or text - subscribe