The tide calendar.

How to read this

Duxbury runs a big tide, routinely nine to eleven feet between low and high. The chart reads like a wall calendar: each box is one day, and its tides are listed in the order they happen, highs in gold, lows in gray, each with its height in feet after the time. Gold boxes with a ▲ mark days when high water tops 11 feet, the month's true monsters. A ▼ flags below-datum lows, when the bay turns into a half mile of walkable sand. Two cautions from experience: the flats fill back in faster than they empty, so track the time on a long walk out, and predictions are astronomy, not weather. A strong onshore wind or a storm can push real water noticeably above these numbers.

August 2026

The story of the month is the week of the 8th through the 15th. The moon passes closest to Earth on the 10th and turns new on the 12th, the same alignment that produces the solar eclipse and the moonless Perseid peak. It also stacks up the biggest water of the month, topping out at 11.8 feet just after midnight on the 13th, with matching drained-out lows near minus 0.7 the following mornings. Prime flats-walking, and a week to give your dinghy some extra scope.

Rest of July