Sunday, June 14, Boston wakes up to clear skies and a comfortable 72°F at Logan this morning, but the cool start is not sticking around for long. A warm inland air mass is set to drive afternoon highs into the mid 80s, with a forecast high near 86°F. Southwest winds will pick up through the day, so sidewalks, bridges and bike lanes may feel a bit fiercer than the numbers suggest. Late tonight, a cold front will move in with showers and thunderstorms, some capable of brief heavy downpours and gusty winds. On top of that, the National Weather Service has issued a Coastal Flood Statement for parts of the eastern shoreline, which means some splashover on low-lying streets is possible around this evening’s high tides.
Afternoon Heat And Wind
Plan for a warm, breezy afternoon, with highs near 86°F and southwest winds generally running 5 to 18 mph, according to NWS Boston. Inland neighborhoods will be the hottest, while spots right along the water hang a bit cooler. Humidity will run lower than in recent days, so it should feel warm rather than swampy. Still, loose outdoor items may need securing, and anyone biking or walking across exposed bridges should be ready for occasionally noticeable gusts.
Tonight: Storms, Fog And Coastal Splashover
Showers and thunderstorms become more likely late Sunday night into early Monday morning, with most of the action expected after about 11 p.m. and continuing through the overnight hours. The overnight low will hover near 62°F. Rainfall totals are expected to land around one tenth to one quarter of an inch, though some heavier pockets are possible inside stronger cells that produce brief downpours and gusty winds.
High astronomical tides arriving with the incoming surge could push water levels up enough to cause minor coastal flooding, with up to one foot of inundation possible in the usual trouble spots. Morrissey Boulevard is specifically called out as vulnerable. Tide guidance from NOAA Tides & Currents lines up that risk with the evening high tide window, so coastal drivers should be ready for splashover and some ponding on shoreline roadways.
Commuter Notes And Boaters
Minor coastal delays are possible this evening where water collects on low-lying routes. The National Weather Service notes that roads should remain passable, but still advises drivers to avoid attempting to cross any flooded stretches. For boaters, Small Craft Advisories remain in effect for the southern coastal waters, with building seas and gusty winds expected overnight. The payoff for riding out the messy late-night weather comes Monday, when a drier, more comfortable air mass settles in, bringing highs near 76°F and lower humidity by afternoon, which should make it the better day for outdoor plans.
