Tide tables

How to use it

Zoom the map to your stretch of coast and click a station. Stations are grouped at low zoom levels; zoom in to see each one. The page lists today's high and low tides with their times and heights, draws the tide curve for the day, and gives the highs and lows for the next 30 days. If a NOAA current station is within 30 km, it also lists today's slack water, flood and ebb times and speeds from the nearest one.

Understanding tides

Tides are the regular rise and fall of sea level caused by the gravitational pull of the moon and sun. Most coastal places get two high tides and two low tides a day, with the cycle repeating about every 12 hours and 25 minutes. The height and timing vary from place to place with the shape of the coastline and the depth of the water, which is why a station a few miles away can be an hour off.

About the data

Predictions come from NOAA's Center for Operational Oceanographic Products and Services (CO-OPS) for more than 3,400 stations on the US coasts, Hawaii, Alaska and US territories. Heights are in feet above Mean Lower Low Water (MLLW), the datum used on US nautical charts; a station without an MLLW datum uses its own station datum. Times are the station's local time, including daylight saving time.

The predictions are astronomical. They leave out wind, air pressure, storm surge and river flow, so the water you see can differ from the table, most of all during storms. How tide predictions work explains how NOAA builds a prediction from the harmonic constituents fitted at each station.