Boston rolled into Sunday, July 19, 2026, under mostly clear skies and a comfy 72°F start, with northwest winds already stirring the harbor. The rest of the day looks like a classic summer postcard: lots of sun, a high near 81°F, and a crisp drop in humidity after last week’s steam bath. The catch is along the shoreline. South-facing beaches are dealing with a High Risk of rip currents from 8 a.m. through this evening, and parts of the southern coastal waters are under Small Craft Advisories. Looking ahead to Tuesday and Wednesday, the pattern turns more humid and unsettled, with rounds of heavy downpours and building surf possible.
Afternoon Winds and Beach Hazards
Northwest winds this afternoon should generally run 13 to 16 mph, with some higher gusts early in the day, while seas continue to slowly settle down from yesterday’s swell. The downside to the improving weather is in the surf zone. A High Risk of rip currents is posted for many south-facing beaches, so stick close to lifeguards and steer clear of jetties and exposed rocks that can funnel stronger water. Boaters and ferry operators should respect the Small Craft Advisories in effect on the southern waters and secure loose gear before heading out. According to the National Weather Service, the advisories and rip current statements cover portions of southeastern Massachusetts and nearby Rhode Island.
Active Pattern Returns Tuesday And Wednesday
The quiet stretch does not last long. Humid air pushes back in on Tuesday, July 21, 2026, setting the stage for showers and a growing chance of heavy downpours from Tuesday night into Wednesday, July 22, 2026. Tuesday’s high should land near 77°F, with south winds picking up, and Wednesday looks breezy with scattered thunderstorms and highs around 82°F. Any heavier rain could trigger brief urban flooding in downpours, and southern offshore waters may see building seas that could reach advisory or even gale levels. For context on last week’s heat and the earlier rip current issues, check out our Wednesday coverage, Boston Swelters.
Commute And Outdoor Plans
Both the morning and evening commutes should stay dry and mostly sunny today, though anyone heading to beaches or ferries should allow a little extra time for gusty winds on exposed bridges and roadways. Tonight cools off nicely, with a low around 60°F and only light northwest breezes after sunset. Monday, July 20, 2026, brings another dry and pleasant day, with highs in the low 80s, which makes it a better bet for outdoor events than the wetter Tuesday and Wednesday window. If you have plans near the waterfront or are traveling by boat, keep an eye on hourly updates as conditions begin to turn more unsettled.
Beach Safety
Follow lifeguard instructions and pay attention to beach flags. A red flag signals dangerous conditions and means you should stay out of the water. If you or someone else is caught in a rip current, float to conserve energy, signal for help, and swim parallel to the shoreline once you are out of the strongest pull. Call 911 immediately if someone is in trouble and cannot make it back safely.
