Report Date & Time: Thursday, August 20, 2026 at 01:21 MST
Today across the New England coast, coastal waters will experience light and variable conditions with overall mild marine weather. Nearshore regions like Boston Harbor will see morning winds around 5 knots out of the west, shifting to an easterly sea breeze by the afternoon, while coastal waters from Cape Cod to Nantucket can expect light southwesterly winds between 5 and 10 knots. Atmospheric conditions will bring patchy morning fog and overcast skies, with a slight chance of scattered afternoon showers as marine surface temperatures hold steady near seasonal averages.
Nearby offshore buoys report average wave sizes ranging from 2 to 3 feet across outer waters, creating minor chop. Significant wave data indicates a primary southeast swell running at 2 feet with an 8-second period, accompanied by a secondary light wind wave component from the west-southwest measured at 1 foot with a short 3-second period. In shorelines protected by inner bays, wave heights remain minimal at 1 foot or less throughout the day.
Tide conditions for regional harbors, including Boston Harbor, feature a morning high tide of 8.38 feet at 5:40 AM, followed by a low tide of 1.90 feet at 11:37 AM. A second high tide will peak late in the afternoon at 9.26 feet at 5:55 PM, before receding toward a late-night low tide shortly after midnight.
raw data from noaa, curated by surforecast pacificwaverider
Credits and References: NOAA National Weather Service Marine Forecasts and National Data Buoy Center (NDBC).