Tides Today & Tomorrow in Grand Isle, LA

TIDE TIMES for Tuesday, July 21, 2026
The tide is currently falling in Grand Isle, LA.

Next low tide : in 29m at 4:23 pm (0.1 ft)
Next high tide (tomorrow) : 4:57 am (1.1 ft)
Sunset today : 7:58 pm
Sunrise tomorrow : 6:14 am
Moon phase : First Quarter (53% illuminated)
Tide Station Location : Station #8761724
Common Questions About Tides

Grand Isle, LA Tides - Oct 2074

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Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Mon	8:14	1.4					6:41	0.5	6:53	6:45		1	Mon
2	Tue	9:39	1.3					7:21	0.7	6:53	6:44		2	Tue
3	Wed	11:03	1.2					7:50	0.8	6:54	6:42		3	Wed
4	Thu	12:32	0.9	12:34	1.1	4:21	0.8	5:12	0.9	6:55	6:41		4	Thu
5	Fri			2:18	1.0	5:39	0.8	4:57	1.0	6:55	6:40		5	Fri
6	Sat			11:26	1.2	6:54	0.7			6:56	6:39		6	Sat
7	Sun			11:46	1.3	9:04	0.6			6:56	6:38		7	Sun
8	Mon					10:35	0.5			6:57	6:37		8	Mon
9	Tue	12:20	1.4			11:27	0.5			6:57	6:35		9	Tue
10	Wed	12:59	1.4					12:16	0.4	6:58	6:34		10	Wed
11	Thu	1:39	1.5					1:06	0.4	6:59	6:33		11	Thu
12	Fri	2:18	1.5					2:00	0.4	6:59	6:32		12	Fri
13	Sat	2:58	1.5					2:58	0.4	7:00	6:31		13	Sat
14	Sun	3:41	1.4					3:51	0.4	7:00	6:30		14	Sun
15	Mon	4:35	1.4					4:37	0.5	7:01	6:29		15	Mon
16	Tue	7:00	1.3					5:13	0.6	7:02	6:28		16	Tue
17	Wed	8:53	1.2					5:31	0.7	7:02	6:27		17	Wed
18	Thu	12:09	0.9	11:12	1.0	3:19	0.9	4:53	0.8	7:03	6:26		18	Thu
19	Fri			12:40	1.0	4:56	0.7	4:27	1.0	7:04	6:25		19	Fri
20	Sat			10:59	1.3	6:17	0.6			7:04	6:24		20	Sat
21	Sun			10:30	1.4	8:01	0.4			7:05	6:23		21	Sun
22	Mon			11:02	1.6	9:46	0.2			7:06	6:22		22	Mon
23	Tue					10:58	0.1			7:06	6:21		23	Tue
24	Wed	12:01	1.6					12:02	0.1	7:07	6:20		24	Wed
25	Thu	1:06	1.7					1:06	0.1	7:08	6:19		25	Thu
26	Fri	2:06	1.6					2:11	0.1	7:08	6:18		26	Fri
27	Sat	2:59	1.5					3:18	0.2	7:09	6:17		27	Sat
28	Sun	3:47	1.4					4:19	0.4	7:10	6:16		28	Sun
29	Mon	4:25	1.2					5:08	0.5	7:10	6:16		29	Mon
30	Tue	8:38	1.0	11:16	0.9			5:37	0.7	7:11	6:15		30	Tue
31	Wed	10:59	0.9	10:37	1.0	6:02	0.8	2:56	0.8	7:12	6:14		31	Wed
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8761724)

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What time does the tide turn (slack tide) in Grand Isle, LA today?

Slack tide in Grand Isle, LA is approximately 10:40 pm — midway between the next high and low tide, when tidal current is weakest. This is the preferred window for boat crossings, underwater visibility, and fishing in areas with strong currents.

Is this week a spring tide or neap tide in Grand Isle, LA?

Grand Isle, LA is currently in a neap phase. Tonight's moon is 53% illuminated. Spring tides (largest swings) occur near new and full moons; neap tides (smallest swings) occur near first and third quarter moons. Tidal ranges this week are near their weekly minimum.

What datum are Grand Isle, LA tide heights measured from?

Tide heights on this page are measured from Mean Lower Low Water (MLLW), the U.S. NOAA standard. A height of 0 ft represents the 19-year average of each day's lower low tide. Negative values indicate a "minus tide" — water levels below that long-term reference.

What factors can affect the tide predictions for Grand Isle, LA?

Tide predictions for Grand Isle, LA come from NOAA's harmonic analysis and are typically accurate within about ±10 minutes on timing and ±0.5 ft on height. Actual water levels can deviate further due to sustained winds, atmospheric pressure changes, river flow, and storm surge. During major weather events, be sure to check US Harbors weather pages for factors that could impact tidal predictions.

Which NOAA station provides tide data for Grand Isle, LA?

Tide data for Grand Isle, LA is sourced from NOAA Station #8761724. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8761724.

What is the moon phase in Grand Isle, LA tonight?

Tonight the moon over Grand Isle, LA is First Quarter (53% illuminated). This places Grand Isle, LA in a neap tide cycle, so tidal ranges are near their weekly minimum this week.

US Harbors Tidal Data

The data in our tide charts, tide tables, and tide graphs is provided by NOAA and others. These predictions are derived mathematically from numerous inputs, including data from historical tide stations and nearby locations where sensors are actively recording. As shown in the tide graph at the top of this page, “Predicted” tides (blue) are what forecasting models expect to happen. “Observed” tides (red) are those recorded by local sensors in real time, overlaid on the predictions for direct comparison. We display Observed water levels for a select group of harbors including Portland, Maine, where a physical sensor monitors water levels in real time.

LEARN MORE ABOUT OUR TIDE DATA

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