What are tides? Tides are the regular rise and fall of the sea, caused mainly by the gravitational pull of the moon and, to a lesser extent, the sun. Most coastal stations are semidiurnal — they see roughly two high tides and two low tides each day.

Spring and neap tides. Near the new and full moon the sun and moon line up and the tidal range is largest (“spring” tides). Near the first and last quarter moons their pull partly cancels and the range is smallest (“neap” tides).

Reading our pages. Each station's chart plots water height, in feet, over the day — above and below the local chart datum. The tide table beneath it lists each event's time, height, and description: High Tide and Low Tide, plus Sunrise, Sunset, Moonrise, and Moonset. All times are in the station's local time zone. Use the Prev and Next links to move between days.

Please note that these predictions are not for navigational purposes.