Boston is on tap for another round of sweltering summer heat this coming week, according to the National Weather Service’s local office.

Heat and humidity is expected to build back up starting Sunday with potential “dangerous heat” for Monday, Tuesday, and possibly into Wednesday, National Weather Service Meteorologist Kristie Smith told the Herald. Actual temperatures will crest into the 90s and heat index values will hover around 100 degrees Monday and Tuesday, Smith said.

“Tuesday is looking to be the hottest day, and then some uncertainty Wednesday,” Smith said. “We’ve got a cold front coming through Wednesday afternoon and evening, which, depending on the timing of that, could shift the threat for that excessive heat into Wednesday.”

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The National Weather Service issued a heat advisory for Monday, which means the heat index will be between 95 and 100 degrees. Smith said the forecasters also put in place an excessive heat watch for Tuesday, which means there is 50% confidence heat index values will approach or exceed 105 degrees.

“These types of temperatures are really hazardous to elderly, children, people working outside, those that are sensitive to the heat, those without air conditioning,” Smith said.

Afternoon thunderstorms could arrive in the city Monday but “they look pretty scattered and may not make it into Boston,” Smith said.

Thursday, Friday, and the start of next week will see seasonable highs, with 70s to low 80s on Friday and upper 50s to low 60s for the end of the week, Smith said.

“The synopsis — really hot, humid thunderstorm chances the first half of the week, and then much more comfortable to round out the work week,” Smith said.

A brutal heat weave hit Boston last month when the city broke a high temperature record after the heat index skyrocketed to 108 degrees. Mayor Michelle Wu declared a heat emergency and opened cooling centers.

Another heat wave settled into Massachusetts this past week as temperatures were forecasted to range from the upper 80s to lower 90s.

Paddlers brave the light rain as they ply the Storrow Lagoon on the Charles River on July 13. (Staff Photo By Stuart Cahill/Boston Herald)

Revealers swim at the opening of City Splash, where people can swim in the Charles River on July 13. (Staff Photo By Stuart Cahill/Boston Herald)
Some of the first swimmers arrive on the dock at the opening of City Splash, where people can swim in the Charles River on July 13. (Staff Photo By Stuart Cahill/Boston Herald)

Groups jump into the 80 degree water at the opening of City Splash, where people can swim in the Charles River on July 13. (Staff Photo By Stuart Cahill/Boston Herald)

Revealers prepare to swim at the opening of City Splash, where people can swim in the Charles River on July 13. (Staff Photo By Stuart Cahill/Boston Herald)