Boston’s forecast swings from a foggy, mild Wednesday to a wet Friday and a much colder, windy Saturday. Wednesday should warm to about 75 degrees as fog and mist give way to partly sunny skies. A brief shower is possible around 3 to 4 p.m., but the rain chance is about 30%, so most plans should stay dry after the morning fog lifts.
West winds Wednesday are forecast at 7 to 12 mph, with gusts up to 23 mph. Wednesday night should be mostly clear, with temperatures falling to around 50 and northwest winds continuing. Thursday is expected to be sunny and cooler, with a high near 60 and no daytime rain.
Friday rain, then a colder weekend
Rain is forecast Friday into early Saturday. Saturday is forecast to bring gusty northwest winds, with highs struggling to reach the low 50s. Sunday should bring more sunshine and lighter winds, though the high is expected to be about 54.
The marine advisory is separate from Boston’s land forecast. The National Weather Service Boston/Norton marine forecast listed a Small Craft Advisory through Wednesday evening for coastal waters from Provincetown to Chatham to Nantucket, with seas of 4 to 6 feet forecast. It also forecast southwest winds of 15 to 20 knots, gusting up to 30 knots, before winds turn west at 10 to 15 knots in the afternoon, with gusts up to 20 knots. These are the conditions in that forecast; they do not establish a general advisory threshold. The supplied forecast lists no land-based watches or warnings for Boston.
A practical step for the rain
For routine rain preparation, Boston’s Flood Safety Tips advise residents to keep leaves, litter and other debris off catch-basin grates because blockages can impede stormwater drainage and contribute to street flooding. That general guidance does not indicate that flooding is expected with Friday’s forecast.
