Tides Today & Tomorrow in Port Isabel, TX

TIDE TIMES for Thursday, August 20, 2026
The tide is currently falling in Port Isabel, TX.

Next low tide : in 8h 44m at 4:19 pm (0.1 ft)
Next high tide (tomorrow) : 3:41 am (1.6 ft)
Sunset today : 8:00 pm
Sunrise tomorrow : 7:03 am
Moon phase : First Quarter (56% illuminated)
Tide Station Location : Station #8779770
Common Questions About Tides

Port Isabel, TX Tides - Apr 1999

< Mar 1999

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May 1999 >

Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date
1	Thu	3:59	1.2	3:30	1.0	10:18	0.7	9:52	0.4	6:19	6:45		1	Thu
2	Fri	4:55	1.2	3:28	1.0	11:13	0.8	10:21	0.3	6:18	6:46		2	Fri
3	Sat	5:56	1.3	3:10	1.0			12:13	0.9	6:17	6:46		3	Sat
4	Sun	7:55	1.3							7:16	7:46		4	Sun
5	Mon	8:58	1.3			12:36	0.2			7:15	7:47		5	Mon
6	Tue	10:32	1.3			1:17	0.1			7:14	7:47		6	Tue
7	Wed	11:50	1.3			1:59	0.1			7:13	7:48		7	Wed
8	Thu			12:42	1.4	2:46	0.1			7:12	7:48		8	Thu
9	Fri			1:35	1.4	3:46	0.2			7:11	7:49		9	Fri
10	Sat			2:20	1.3	5:00	0.2			7:10	7:49		10	Sat
11	Sun			2:43	1.3	6:06	0.2			7:09	7:50		11	Sun
12	Mon			2:58	1.2	7:09	0.3	8:39	0.9	7:08	7:50		12	Mon
13	Tue	12:50	1.1	3:12	1.2	8:17	0.4	8:54	0.8	7:07	7:51		13	Tue
14	Wed	2:33	1.2	3:26	1.1	9:21	0.5	9:19	0.5	7:06	7:51		14	Wed
15	Thu	3:49	1.3	3:38	1.1	10:21	0.6	9:51	0.3	7:05	7:52		15	Thu
16	Fri	4:56	1.4	3:46	1.0	11:29	0.8	10:29	0.1	7:04	7:52		16	Fri
17	Sat	6:09	1.5	3:47	1.1			12:57	1.0	7:03	7:53		17	Sat
18	Sun	7:28	1.6							7:02	7:53		18	Sun
19	Mon	8:48	1.6			12:06	-0.2			7:01	7:54		19	Mon
20	Tue	10:36	1.6			1:02	-0.2			7:00	7:54		20	Tue
21	Wed	11:55	1.6			1:57	-0.2			7:00	7:55		21	Wed
22	Thu			12:50	1.5	2:54	-0.1			6:59	7:55		22	Thu
23	Fri			1:40	1.4	4:03	0.1			6:58	7:56		23	Fri
24	Sat			2:17	1.3	5:22	0.3	9:06	0.9	6:57	7:56		24	Sat
25	Sun			2:29	1.2	6:32	0.4	8:54	0.8	6:56	7:57		25	Sun
26	Mon	1:07	1.0	2:31	1.1	7:43	0.6	9:00	0.7	6:55	7:57		26	Mon
27	Tue	2:40	1.1	2:36	1.0	8:55	0.7	9:14	0.5	6:54	7:58		27	Tue
28	Wed	3:49	1.2	2:43	1.0	9:52	0.8	9:31	0.4	6:54	7:58		28	Wed
29	Thu	4:42	1.3	2:44	1.0	10:45	0.9	9:52	0.3	6:53	7:59		29	Thu
30	Fri	5:33	1.3					10:16	0.2	6:52	7:59		30	Fri
Date		High Tide				Low Tide				Sun		Moon	Date
Date		AM	ft	PM	ft	AM	ft	PM	ft	Rise	Set	Moon	Date

Tidal Data Source: (8779770)

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What time does the tide turn (slack tide) in Port Isabel, TX today?

Slack tide in Port Isabel, TX is approximately 10:00 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 Port Isabel, TX?

Port Isabel, TX is currently in a neap phase. Tonight's moon is 56% 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 Port Isabel, TX 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 Port Isabel, TX?

Tide predictions for Port Isabel, TX 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 Port Isabel, TX?

Tide data for Port Isabel, TX is sourced from NOAA Station #8779770. View the official NOAA station page at https://tidesandcurrents.noaa.gov/stationhome.html?id=8779770.

What is the moon phase in Port Isabel, TX tonight?

Tonight the moon over Port Isabel, TX is First Quarter (56% illuminated). This places Port Isabel, TX 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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