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Boston Sizzles as Heatwave Drives Temperatures into the Mid-90s

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Published on August 12, 2025
Boston Sizzles as Heatwave Drives Temperatures into the Mid-90sSource: Google Street View

Boston is in the thick of an intense heatwave, with today's temperatures soaring into the mid-90s. The South Coast breeze that will pick up this morning might offer a slight respite, but don't expect much relief from the heat until later in the week, according to the National Weather Service. Tonight's forecast suggests mostly clear skies with lows hovering around 70.

With the mercury rising, the city's swelter is intensified by high humidity levels, which have the potential to push heat index values to near triple digits in several areas. "Remember to look before you lock your car! Never leave your kids or pets left behind in a hot vehicle," warns NBC Boston. In addition to the heat, Bostonians are advised to be aware of poor air quality resulting from Canadian wildfire smoke, with particular caution urged for those with respiratory issues.

The heatwave is forecasted to persist into Wednesday, with a slight chance of showers in the evening as a cold front approaches from the northwest. This could also bring isolated thunderstorms to the area. Looking ahead, Thursday will continue with the possibility of rainfall and thunderstorms, particularly after 11 a.m. The likelihood of precipitation is 50% during the day, tapering off to 30% by nighttime.

Relief is on the horizon for Boston residents by the end of the week. Following the passage of the cold front, conditions on Friday are expected to be sunnier, with a significant dip in humidity and high temperatures settling into the more comfortable lower 80s. And, while the weekend will see a rebound with highs reaching the mid-80s, it's a reprieve compared to the scorching days we're currently experiencing.

The city is also monitoring weather patterns beyond the local forecast, keeping an eye on tropical activity in the Atlantic. The storm named Erin is making waves over the ocean and could strengthen into a major hurricane by the weekend, according to NBC Boston's coverage. It's still too early to determine if Erin will impact the U.S., but updates will be provided as the situation develops.

Boston-Weather & Environment