Tide charts / Texas

Texas tide charts

The NOAA tide prediction stations this site carries on the Texas coast: 1 of them, each of which returned high and low waters when it was added. NOAA publishes predictions for more Texas stations than these. The table ranks the coast by mean tidal range, because that is the number that decides how much of a beach, a flat or a ramp is uncovered between one high water and the next — and it is not constant along a single state's shoreline.

Stations ranked by mean tidal range

Mean range below is the average height difference between one predicted extreme and the next, computed over the same seven days for every station in the table, beginning Monday, October 26. It is derived from NOAA's own predicted extremes; it is not a NOAA-published statistic.

NOAA tide prediction stations in Texas, ranked by mean range over the same seven days beginning Monday, October 26. Heights in feet above mean lower low water.
Station	Mean range, ft	Largest swing, ft	Prediction type	Stored through
Port Aransas 8775237	1.46	1.64	Reference (harmonic)	2027-10-25

Ranked from the stored predictions described on the methodology page. Every station holds the same twelve-month window, refreshed in one pass and recorded there; the printable tide chart tool requests any dates you want from NOAA directly.

What the spread in this table means for you

The spacing matters too, and here it is not the textbook twice-a-day rhythm. At Port Aransas NOAA's predictions hold 476 high waters and 476 low waters across 365 days, and successive high waters sit 18 h 25 min apart on average: on 233 of those 365 days the predictions hold a single high water rather than two. Read the times off the station page for the day you need rather than counting forward from a known high.

Two stations a few miles apart can also differ in timing, not just range, because a subordinate station's predictions are time-and-height offsets applied to a reference station's harmonic predictions. Where a station is subordinate, the table above names the reference station its numbers are derived from, and so does its own page.

Every Texas station, with its own curve

RisingFalling

Port Aransas tide chart Station 8775237 at 27.8397, -97.0725. Mean range 1.46 ft over the week shown. Highest in the stored window 1.745 ft, lowest 0.106 ft.

What these predictions are, and what they are not

Every number on every Texas page here is an astronomical tide prediction from NOAA's CO-OPS predictions product: the tide the sun and moon would produce on their own. Wind, atmospheric pressure, river discharge and storm surge are not in them. An onshore storm can hold the water well above the predicted line for a day; a hard offshore wind can hold it below. Nothing on this site tells you whether a place is safe to walk, swim, anchor or cross.

Times of slack water — when a tidal current stops running — are a different quantity again, predicted from a different NOAA product, and they do not share a clock with high and low water. High tide vs slack tide works through why.

Heights are feet above mean lower low water, the datum NOAA uses for US tide predictions. A predicted height of 1.0 ft does not mean a foot of water under a hull: it means the surface is predicted to sit a foot above chart datum, and the depth anywhere is whatever the chart says plus that number.