Boston wakes up to a cool, mostly sunny Wednesday morning, about 61°F near Logan, and temperatures will climb into the mid-70s this afternoon with a high near 76°F. Humidity stays on the comfortable side across the city, so downtown lunch breaks and evening walks should feel pleasant. There is still a minor coastal concern, since high astronomical tides late Wednesday could push shallow water onto a few low-lying shoreline streets, although the broader coastal flood threat has eased.
Coastal Splashover Risk Easing
An earlier Coastal Flood Statement that covered parts of the eastern shoreline has mostly been allowed to expire, and forecasters say any storm surge will stay under a foot and is more likely to cause shallow ponding than widespread inundation, according to NWS Boston/Norton. Our usual trouble spots list still applies this week, so if you have evening waterfront plans, give yourself a little extra time and steer clear of the lowest-lying stretches of shoreline.
Thursday, June 18, 2026: Gusty South Winds And Showers
Thursday turns more unsettled. Rain showers are likely with patchy fog in the morning, then showers and a few thunderstorms are possible in the afternoon and evening. South winds are expected to increase to 8 to 21 mph with gusts up to around 32 mph in some spots, and the main severe threat should remain to the west and south of Boston. Plan on an umbrella for Thursday and be ready for brief, heavy downpours paired with gusty winds.
Mariners And Commuters
Mariners should prepare for rougher conditions. Small Craft Advisories and Gale Watches are expected for portions of the coastal waters on Thursday, so check with your operator before heading out. Ferry crossings may be choppy, and cyclists or bridge walkers should be ready for sudden gusts. For drivers, shoreline roads that tend to flood at high tide may still see shallow ponding this evening.
Juneteenth And The Weekend
Friday, June 19, 2026 (Juneteenth) should be sunny with a high near 79°F and west winds of 13 to 17 mph, which means generally favorable weather for outdoor events. Friday into the weekend looks dry and comfortable, with highs mainly in the mid-70s to low-80s and lower humidity. Showers are more likely to return at the start of next week, so plan accordingly if you have events on Monday or Tuesday.
Bottom line, enjoy the pleasant weather today, keep an eye on the waterfront tonight, and be ready for gusty, wetter conditions on Thursday, June 18, 2026.
