Grand Isle tide times
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Tide chart · today
The next 7 days
Grand Isle at a glance
- Tides
- Once a day
- Typical range
- 1.1 fthigh to low
- Highest of 2027
- 1.8 ftWed, Oct 20
- Lowest of 2027
- -1.1 ftWed, Jan 20
- Record high
- 5.7 ftAug 29, 2021
The tide at Grand Isle
- Pattern
- Once-daily
Usually just one high tide and one low tide a day, about 24 h 50 min apart - the pattern of most of the Gulf of Mexico. Form number 9.31. - Typical range
- 1.1 ft from the higher high to the lower low on an average day (0.32 m) - a smaller range than 86% of the 235 places on this site. The mean range, high to low, is 1.0 ft.
2027: the biggest and smallest tides
| Wed, Oct 20 | 12:40 am | 1.8 ft | |
| Thu, Sep 23 | 3:15 am | 1.8 ft | |
| Sat, Aug 28 | 7:30 am | 1.7 ft |
| Wed, Jan 20 | 6:15 am | -1.1 ft | in the dark |
| Wed, Feb 17 | 5:12 am | -0.9 ft | in the dark |
| Tue, Feb 2 | 5:49 am | -0.7 ft | in the dark |
| Thu, Jan 21 | 7:10 am | -1.1 ft | |
| Tue, Dec 14 | 8:28 am | -0.7 ft | |
| Sun, Dec 26 | 7:10 am | -0.7 ft |
202 low tides in 2027 drop below zero - below the average lower low water - and uncover more shore than usual.
Records
- Highest water recorded
- 5.7 ft (1.73 m) on Aug 29, 2021 - 4.6 ft above the average higher high.
- Lowest water recorded
- -3.4 ft (-1.02 m) on Jan 13, 1964.
- Highest tide the moon and sun can raise
- 1.8 ft (0.55 m) - the highest astronomical tide in NOAA’s 19-year cycle, which fell on Oct 12, 2025.
Tide times nearby
- Port Fourchon18 mi southwest
- Southwest Pass, Mississippi River40 mi southeast
- Pilottown42 mi east
- Shell Beach45 mi north
- New Orleans (Lake Pontchartrain)54 mi north
See the moon move the ocean - the same tide, on a globe seen from the moon.
Heights are above mean lower low water (MLLW), the zero of US charts; times are local. The year’s tides are NOAA’s official predictions - wind and air pressure can move the real water a foot or more. Form number: (K1+O1)/(M2+S2) from NOAA’s harmonic constants - below 0.25 twice-daily, above 3 once-daily. Louisiana, 29.263°N 89.957°W. Predictions and records: NOAA CO-OPS, station 8761724. Not for navigation or safety. For a boat, a crossing of sand that floods, or a swim, use the official tables and local advice. No ads, no tracking.