5-day weather forecast Boston 18-06-2026

* WHAT...Up to one foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (2.9 to 13.0 feet Mean Lower Low Water) around the evening high tides. * WHERE...Eastern Essex MA, Suffolk MA, Eastern Norfolk MA, Eastern Plymouth MA, Barnstable MA and Dukes MA Counties. * WHEN...From 9 PM EDT this evening through late Monday night. The evening high tide periods tonight, Sunday night and Monday night are of the greatest concern. * IMPACTS...Shallow pockets of flooding less than one foot deep affects the lowest lying areas along the coast, including Morrissey Boulevard in Boston. Most roads remain passable. Flooding up to one foot deep affects coastal roads on the North Shore from Salem to Gloucester and Newburyport. Rough surf will cause flooding on some coastal roads around the time of high tide due to splashover.

* WHAT...Up to one half foot of inundation above ground level expected in low-lying areas near shorelines and tidal waterways (4.4 to 7.2 feet Mean Lower Low Water) around the evening high tides. * WHERE...Washington, Southern Bristol MA, Southern Plymouth MA, Southeast Providence RI, Eastern Kent RI, Bristol RI, and Newport RI Counties. * WHEN...From 6 PM EDT this evening through late Monday night. The evening high tide periods tonight, Sunday night and Monday night are of the greatest concern. * IMPACTS...Minor coastal flooding occurs along the most vulnerable shoreline locales in Newport, Portsmouth and Middletown. This includes flooding at parking lots near beaches in Newport, and a portion of Hazard Road. Minor coastal flooding also occurs on several streets in the Common Fence Point area.

* WHAT...Warm air temperatures in the 80s to near 90 may cause people to underestimate the dangers of the cold water temperatures in the upper 50s and lower 60s. * WHERE...In Maine, Coastal York, Coastal Cumberland, Sagadahoc, Lincoln, Knox and Coastal Waldo Counties. In New Hampshire, Coastal Rockingham County. * WHEN...From Sunday morning through Sunday evening. * IMPACTS...The cold water temperatures can quickly cause hypothermia to anyone immersed in the water. When the water temperature is below 60 degrees, the average submerged person could lose dexterity within minutes and be unable to accomplish simple tasks. Anyone on boats or paddlecraft should use extreme caution to avoid this threat.