Sunday clearing skies herald better Boston air quality
Sunday clearing skies across Massachusetts will herald cleaner air, lower humidity, and seasonable highs near 78°F after Saturday's wildfire smoke and severe storms. Mostly sunny weather follows Monday before midweek storm chances return Tuesday and Wednesday, according to StormTeam 5 meteorologist David Williams.
Key Takeaways
- Sunday brings clearing skies, a northwest breeze, and a high near 78°F with lower humidity and no lingering wildfire smoke.
- Saturday's Boston-area air quality spiked to an unhealthy AQI of 155 before thunderstorms scrubbed the haze.
- Monday stays mostly sunny near 82°F; Tuesday brings a thunderstorm chance and Wednesday a shower chance.
- The midweek unsettled stretch is brief, with clearing again Thursday and pleasant conditions into the weekend.
For readers tracking how outdoor air and heat affect recovery and daily wellness, clearer skies after a polluted stretch matter as much as the temperature itself. Coverage in the Longevity & Biohacking section often returns to the same practical question: when is it safer to get outside again?
What happened Saturday, and why does Sunday matter?
A plume of wildfire smoke from Canada and Minnesota drifted over the Northeast on Saturday, casting haze from Revere Beach to Fenway Park. CBS Boston reported Boston-area air quality started moderate on AirNow.gov but deteriorated to 155—an unhealthy level—as smoke thickened.
Visitor Carol D'Eon described "a heaviness in the air" at the Revere Beach International Sand Sculpting Festival. Those fine pollutants can be especially risky for older adults and people with underlying conditions.
Thunderstorms later Saturday eased the haze and delayed the Red Sox-Rays start by an hour. WCVB's David Williams said rain from a strong system was already clearing the smoke, with Sunday expected to arrive breezy, sunny, and free of that plume for at least the next few days.
How severe was the weekend storm threat?
StormTeam 5 had a weather alert for strong to severe storms Saturday into the overnight hours, citing gusty winds, heavy rain, flash-flood risk farther south, and a tornado threat greatest farther west. Dew points sat in the mid to upper 60s, keeping conditions muggy ahead of a cold front pushing east from New York.
Heavy rain chances were highest along and south of the Massachusetts Turnpike—potentially a half-inch to an inch, and locally up to two inches. Northern areas still saw rain, but with lower odds of the heaviest totals. The severe threat was expected to diminish late evening as activity moved offshore overnight.
When do storm chances return midweek?
After Sunday's reset, Monday looks mostly sunny with a high near 82°F. Tuesday carries a chance of thunderstorms (high near 80°F), and Wednesday a chance of showers (high near 82°F). Clearing returns Thursday (78°F), with pleasant Friday weather (80°F) and mostly sunny skies Saturday (83°F).
Williams also noted the region has endured one of the hottest summers on record, but the near-term outlook shows no 90s as the week unfolds—welcome news after sticky days and smoke-driven air-quality stress.
Bottom line: Sunday's clearing does more than reset weekend plans. It will herald a short window of cleaner air and milder humidity before another brief round of midweek storms.