Boston rolled into Friday, June 12 under a warm, muggy sky, with Logan Airport (KBOS) already reporting about 73°F at 4:54 a.m. EDT and dew points near 69°F. In plain English, the air is sticky, especially near the harbor. Coastal neighborhoods should run a bit milder than inland spots, but scattered showers and a few thunderstorms are on the table later in the day.
Afternoon Forecast
Expect a band of showers to slide through between about 8 a.m. and 11 a.m. Scattered thunderstorms are possible from late morning into early afternoon and again this evening, with Boston’s high near 80°F. Any storms that manage to pop could dump brief heavy downpours and kick up gusty winds, with the more serious severe threat focused well inland later tonight. Heat Advisories across much of interior Massachusetts and parts of northern Connecticut run through 8 p.m., and an Air Quality Alert is posted from 11 a.m. to 11 p.m. in several zones, according to the National Weather Service Boston/Norton.
Heat And Humidity
A sea breeze should keep the immediate waterfront a touch more comfortable, with Boston itself topping out in the low 80s, while towns west and south of I‑95 heat up more aggressively. Dew points in the upper 60s to low 70s will make it feel notably stickier inland, pushing heat‑index values into the mid‑90s for some communities, per the Boston Globe. If you are planning outdoor work or exercise away from the water, hydrate frequently, ease up on strenuous activity during the peak afternoon hours, and keep an eye on heat‑vulnerable neighbors and pets.
Weekend Outlook
Dryer air slides in for the weekend, with highs in the mid‑80s Saturday and Sunday and noticeably lower humidity on Saturday. The next round of showers and thunderstorms looks most likely Sunday night into Monday. For a deeper dive into how this week’s pattern set the stage, check out the chilly‑to‑steamy setup.
Commuter And Boater Notes
Drivers should be ready for pockets of heavy rain that can quickly reduce visibility, slow the commute, and interfere with outdoor events. Having a plan B indoors for tonight’s activities is a smart move, and it is worth watching real‑time transit alerts if storms start to fire. On the water, mariners can expect seas generally 1–3 ft and winds below small‑craft advisory levels for now, but should still check updated marine forecasts before heading out, according to the National Weather Service Boston/Norton. Keep a charged phone handy and be ready to head for shore or shelter if heavy storms or gusty winds develop.
