Port Isabel, TX Tide Chart
Today's high and low tide times for Port Isabel, TX — see the next high and low tide, water heights, and a live tide chart, straight from NOAA.
On Saturday, August 8, Port Isabel has high tide at 4:33 AM (1.7 ft), and low tide at 6:19 PM (−0.5 ft). These are NOAA astronomical predictions in Port Isabel local time, with heights in feet above MLLW.
It's 9:25 PM Central Daylight Time in Port Isabel, TX.
Tide chart
How to read this chart
Pick the number of days with Days · hold or Zoom out to slide to other dates · tap the curve for exact heights.
Dark bands are night. Heights are feet above MLLW; times are the station's own local time.
Not a flood, navigation, or public-safety forecast.
Tide times and predicted heights: NOAA CO-OPS.
See the numeric tide table below.
Port Isabel tide times for Saturday, August 8
| Tide | Time | Height |
|---|---|---|
| High tide | 4:33 AM | 1.7 ft |
| Low tide | 6:19 PM | -0.5 ft |
Predicted heights above MLLW (mean lower low water), in Port Isabel local time, from NOAA station 8779770. For any other day, use the chart above. Refreshed daily.
Related astronomical information
Calculated astronomical positions for these coordinates. Local weather and conditions are not modelled.
Also see sunrise & sunset in Brownsville, moonrise, moonset & the phase in Brownsville, and the Sun, Earth & Moon movement simulator for Brownsville, to watch how the three move together over a day, a week or a month.
Next king tides
The biggest predicted tides of the coming year at this station, and the lowest-water windows that typically follow — periods with some of the highest predicted astronomical tides of the year. Consult official local forecasts and alerts before planning any beach, boating or shoreline activity.
Computed from a full year of NOAA predictions: the top 10% of high tides, grouped into date windows.
Sun & moon
Spring tides follow the new and full moon: see the full moon calendar or today's moon phase.
Find high tides by date
The next 5 days to start — every high and low. Add 5 more days as many times as you like, or pick any range up to a year out.
What the tides are like at Port Isabel
Port Isabel has just one high tide and one low tide most days — a diurnal tide pattern, cycling about once every 24 hours 50 minutes. Single daily tides are typical of the Gulf of Mexico and make for gentle, slow water changes. The tidal range here is small, typically 1 to 2 feet. For the exact heights and times today, read them straight off the live chart above — it's drawn from NOAA's harmonic prediction for this station.
About Port Isabel
These coordinates are what every time on this page is solved for — sunrise, moonrise and the rest are computed from this exact point, not from a regional average.
About this station
NOAA station 8779770 (Port Isabel) sits at 26.06, -97.22 on the Gulf Coast. Predictions on this page come straight from NOAA's harmonic model for this station — heights in feet above MLLW, times in the station's local time. Conditions a few miles along the shore can differ, so pick the station nearest where you'll actually be.
Nearest stations: Rockport, TX (136 mi) · Galveston, TX (269 mi) · Sabine Pass, TX (326 mi) · Grand Isle, LA (496 mi) · New Orleans, LA (513 mi)
Official source
For anything safety-related, go straight to NOAA's own prediction page for this station, not this page — and see what an astronomical prediction leaves out before you rely on the times above:
How many tides a day does Port Isabel, TX get?
Port Isabel typically gets just one high tide and one low tide each day — a diurnal pattern. Exact times for today are on the live chart above.
What is the tidal range at Port Isabel, TX?
The range between low and high water at Port Isabel is small, typically 1 to 2 feet. The chart above shows the exact predicted heights for the days you pick, straight from NOAA station 8779770.
Where does the tide data come from?
Straight from NOAA CO-OPS, the official U.S. source for tide predictions — for Port Isabel, TX it uses the NOAA station listed above. Heights are in feet above MLLW (mean lower low water, the standard chart datum) and times are shown in the station's own local time.
How far ahead can I see the tides?
Tide predictions are computed from astronomy (the positions of the moon and sun), so they're available about a year ahead. Use the date-range finder to list every high tide between any two dates — for general reference and low-risk scheduling only. Before any marine or shoreline activity, confirm conditions with official local forecasts, alerts, harbor guidance, and NOAA.
What is a king tide?
An informal name for the highest tides of the year, which happen when a new or full moon lines up with the moon's closest approach to Earth. In the finder, the top 10% highest tides in your range are marked with a crown — periods with some of the highest predicted astronomical tides of the year.
What actually makes the tide bigger or smaller?
The engine is gravity: the moon and sun pull the ocean into bulges. When they line up at a new or full moon you get the biggest swings (spring tides); at quarter moons their pulls partly cancel (neap tides), and the moon's closest approach (perigee) super-sizes things further — that's a king tide. River flow, the shape of the bay, and long-term sea-level cycles can also affect the actual water level, which is why real conditions can differ from the astronomical prediction shown here.
What are the highest tides in the world — and in the U.S.?
The world's largest tides are in Canada's Bay of Fundy, where the range between low and high can top 50 feet (it's outside NOAA's network, so it isn't listed here). In the U.S., the giants are Alaska's Cook Inlet — Anchorage sees swings around 26–30 feet — along with Southeast Alaska ports like Skagway, and on the East Coast, Eastport, Maine at roughly 18 feet. All of those have dedicated pages here.
Can I save my home beach and other spots I follow?
Yes — tap ＋ Add to Saved Stations next to any station's name (it turns into a green Saved note), or ＋ Add nearest inside the Saved Stations dropdown to add the station closest to you (allow location access). Your saved spots appear as one-tap cards on the tides home page, the Default column's radio button picks your primary station, and Edit removes stations. Everything is stored on your device; no account needed.
Is this free? Do I need an account?
Completely free, no sign-up. It's built on public NOAA data and works on any device.