Record 'Heat Dome' Warnings Across MA: How Sizzling Could It Really Get Tuesday?

MASSACHUSETTS — Tuesday could become the hottest day in more than a decade across Massachusetts and one of the hottest in history as temperatures soar past 100 degrees in most areas with a feels-like temperature of up to 110 degrees.

If Boston hits 100 degrees — which is likely with the National Weather Service forecasting a high of 102 degrees — it will be the first time in three years that Boston has hit triple digits. Boston last hit 100 degrees in June in 2022 with an all-time June record high of 100 degrees (set four years ago).

Boston's all-time high temperature is 104 degrees — reached on July 4, 1911.

An Excessive Heat Warning remains in effect until 8 p.m. on Tuesday.

"Heat-related illnesses increase significantly during extreme heat and high humidity events," the National Weather Service said. "Drink plenty of fluids, stay in an air-conditioned room, stay out of
the sun, and check up on relatives and neighbors."

Most cities and towns across the state have opened cooling centers and splash pads, waived pool fees, canceled outdoor recreational activities and community events, and arranged for "soak the kids" events with local fire departments on Tuesday.

The MBTA said service will be slowed because of heat-related equipment issues.

"Passengers are encouraged to prepare for longer travel times on all Commuter Rail trains today due to extreme heat conditions and weather-related speed restrictions in effect throughout the network," the MBTA said. "The city of Boston and surrounding communities have issued an extreme heat advisory. Please stay hydrated and remember to have plenty of drinking water with you while you travel. Plan ahead and be sure that your cell phone and other devices, such as personal fans are fully charged."

The heat will hover into the overnight with a record-high low temperature still near 80 degrees Tuesday night.

Wednesday will be the transition day with highs up to 91 degrees early in the day with temperatures falling amid a chance of showers and thunderstorms in the afternoon.

Thursday will be a much cooler day with a high near 70 degrees. Temperatures will remain at or slightly below normal levels through Saturday before things heat up again next week.

(Scott Souza is a Patch field editor covering Beverly, Danvers, Marblehead, Peabody, Salem and Swampscott. He can be reached at Scott.Souza@Patch.com. X/Twitter: @Scott_Souza.)