What do the numbers on a tide chart mean?

They usually label predicted high- and low-water times and heights for a named station. Read the units and vertical datum with every height.

How can I tell whether the tide is coming in or going out?

On a curve, water is predicted to rise between a low and the next high and fall between a high and the next low. Confirm the date and time zone.

What does a negative tide height mean?

It means the predicted water level is below the chart datum used by that source. It does not mean there is negative depth or no water.

Is high tide the same time everywhere nearby?

No. Timing can differ between stations, inlets, rivers, bays, and beaches. Use the station that best represents the intended location.

Does a tide chart show current speed?

No. A water-level chart shows predicted height. Current speed and direction use separate predictions and may turn at different times.

Can weather change the charted tide?

Weather does not rewrite the astronomical prediction, but wind, pressure, runoff, waves, and local conditions can make observed water differ from it.

How to Read a Tide Chart Step by Step

Learn how to read tide-chart dates, times, heights, datums, stations, and rising or falling water, then compare predictions with weather and observations.