Boston hits 101 degrees during heat wave, breaking June temperature record

Boston recorded its first official heat wave of 2025 and hit 101 degrees today, as extreme weather set new temperature records in the city.

Logan Airport at 9 a.m. Tuesday recorded a temperature reading of 90 degrees for the third day in a row. WBZ-TV’s NEXT Weather forecast calls for the city to reach a high of 101 degrees later today. It will be the hottest day in Boston in three years.

The National Weather Service has Boston and much of Massachusetts under an extreme heat warning, and Boston Mayor Michelle Wu has declared a heat emergency in the city through Tuesday.

Record temperature in Boston

Records have already been broken Tuesday in Boston. Shortly before 3 p.m. Boston officially hit 101, breaking the previous daily record of 95 that was set on June 24, 2013 and marking the highest temperature ever seen in Boston for the month of June.

And the hottest temperature ever recorded in Boston was 104 degrees on July 4, 1911.

“I don’t think we’re getting 104,” WBZ-TV executive weather producer Terry Eliasen said. “But I wouldn’t say it’s totally impossible.” 

Heat index today

It will feel even hotter than the actual temperature outside thanks to the heat index, which takes into account the humidity.

The National Weather Service says conditions will be “dangerously hot,” with heat index values up to 110 degrees. 

Heat stroke is a concern for anyone who will be outdoors in these conditions. The Centers for Disease Control recommends wearing light, loose-fitting clothing, staying hydrated and taking it slow if outside.

Click here for a list of pools and cooling centers that are open in Boston today during the heat emergency. 

Hozier concert in Boston

For those heading to night two of Hozier at Fenway Park, there are special policies in place to keep fans cool and hydrated.

The ballpark is allowing concertgoers to bring in plastic and refillable water bottles, as well as personal mini fans. Misting fans will be set up near each entrance gate and at the first aid station. 

When will the heat wave end?

Temperatures will be in the low 90s for inland parts of Massachusetts on Wednesday, but Boston could stay in the 80s, bringing an end to the heat wave. 

Things will cool down significantly after that, with temperatures in the low 70s for Thursday, Friday and Saturday. Temperatures could start heating up again, however, by next Monday.