Weather for Grand Isle, Louisiana
Current Weather
Five Day Weather Forecast
Tue
H: 85°F
L: 77°F
Wed
H: 85°F
L: 79°F
Thu
H: 87°F
L: 83°F
Fri
H: 87°F
L: 83°F
Sat
H: 89°F
L: 81°F
Air Quality
Nitrogen Dioxide: 0.9 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 61 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:01 PM
Daylight: 13 hrs 51 mins
Moon Transit: 1:29 PM
Moonset: 8:39 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:28 AM - 2:58 AM12:59 AM - 3:29 PM
Minor Periods
8:09 PM - 9:39 PM5:43 AM - 7:13 AM
Action Rating: 5 out of 5
Special Marine Warning issued July 14 at 6:10AM CDT until July 14 at 8:15AM CDT by NWS New Orleans LA
Effective: Tue July 14, 2026, 6:10 AM
Expires: Tue July 14, 2026, 8:15 AM
SMWLIX The National Weather Service in New Orleans has issued a * Special Marine Warning for... Coastal Waters from Port Fourchon LA to Lower Atchafalaya River LA out 20 nm... Coastal waters from the Southwest Pass of the Mississippi River to Port Fourchon Louisiana out 20 NM... Terrebonne Bay... * Until 815 AM CDT. * At 610 AM CDT, a cluster of severe thunderstorms capable of producing waterspouts was located along a line extending from near Timbalier Bay to 7 nm north of Caillou Bay, moving northeast at 5 knots. HAZARD...Waterspouts and wind gusts 34 knots or greater. SOURCE...Radar. IMPACT...Waterspouts can quickly form and capsize boats...damage vessels and oil rigs...and create suddenly higher waves. Small craft could be damaged in briefly higher winds and suddenly higher waves. * Locations impacted include... Timbalier Bay and Terrebonne Bay.
Strong winds will be dangerous for boaters or anyone near the water. Boaters should avoid waterspouts and never try to navigate near them. Make sure all on board are wearing life jackets. Seek shelter or move to safe harbor until hazardous weather passes.
Weather Forecast
Air Quality
Nitrogen Dioxide: 0.71 μg/m3
Sulphur Dioxide: 0.6 μg/m3
Ozone: 64.04 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:01 PM
Daylight: 13 hrs 51 mins
Moon Transit: 1:29 PM
Moonset: 8:39 PM
Moon Phase: New
Moon Illumination: 1.9%
Best Times for Fishing or Hunting
Major Periods
12:28 AM - 2:58 AM12:59 AM - 3:29 PM
Minor Periods
8:09 PM - 9:39 PM5:43 AM - 7:13 AM
Action Rating: 5 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 0.57 μg/m3
Sulphur Dioxide: 0.59 μg/m3
Ozone: 55.33 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:01 PM
Daylight: 13 hrs 50 mins
Moon Transit: 2:28 PM
Moonset: 9:22 PM
Moon Phase: New
Moon Illumination: 0.2%
Best Times for Fishing or Hunting
Major Periods
1:30 AM - 4:00 AM1:58 PM - 4:28 PM
Minor Periods
8:52 PM - 10:22 PM6:56 AM - 8:26 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 0.52 μg/m3
Sulphur Dioxide: 0.48 μg/m3
Ozone: 54.54 μg/m3
Astronomical
Sun Transit: 1:05 PM
Sunset: 8:00 PM
Daylight: 13 hrs 49 mins
Moon Transit: 3:21 PM
Moonset: 9:58 PM
Moon Phase: New
Moon Illumination: 2.4%
Best Times for Fishing or Hunting
Major Periods
2:25 AM - 4:55 AM2:51 PM - 5:21 PM
Minor Periods
9:28 PM - 10:58 PM8:06 AM - 9:36 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 0.78 μg/m3
Sulphur Dioxide: 0.78 μg/m3
Ozone: 68.25 μg/m3
Astronomical
Sun Transit: 1:06 PM
Sunset: 8:00 PM
Daylight: 13 hrs 48 mins
Moon Transit: 4:09 PM
Moonset: 10:31 PM
Moon Phase: Waxing Crescent
Moon Illumination: 7.0%
Best Times for Fishing or Hunting
Major Periods
3:16 AM - 5:46 AM3:39 PM - 6:09 PM
Minor Periods
10:01 PM - 11:31 PM9:10 AM - 10:40 AM
Action Rating: 3 out of 5
Weather Forecast
Air Quality
Nitrogen Dioxide: 0.79 μg/m3
Sulphur Dioxide: 0.39 μg/m3
Ozone: 47.88 μg/m3
Astronomical
Sun Transit: 1:06 PM
Sunset: 8:00 PM
Daylight: 13 hrs 47 mins
Moon Transit: 4:55 PM
Moonset: 11:01 PM
Moon Phase: Waxing Crescent
Moon Illumination: 13.9%
Best Times for Fishing or Hunting
Major Periods
4:03 AM - 6:33 AM4:25 PM - 6:55 PM
Minor Periods
12:00 AM - 12:00 AM10:12 AM - 11:42 AM
Action Rating: 3 out of 5