Ugh, not again.

After a warmer than normal July across the region, the hot weather has returned as the National Weather Service issued another “heat advisory.”

Meteorologists were warning that heat index values could spike up to 96 degrees across parts of Massachusetts during the next couple of days.

“Hot temperatures and high humidity may cause heat illnesses,” the National Weather Service wrote in its heat advisory for Thursday and Friday. “Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.

“Take extra precautions when outside,” NWS added. “Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and
heat stroke.”

Boston Mayor Michelle Wu announced a heat advisory through Saturday. The city’s heat advisory threshold is 3 days or more of 90 degrees heat index, sustained for 2 or more hours per day.

“With the forecast for the coming days reaching extreme temperatures, we encourage all residents to take time to prepare,” Wu said in a statement.

“Staying hydrated, taking breaks from working outside, and paying attention to your health are important steps for ensuring our city remains healthy and cool during this hot and humid period,” the mayor added.

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Anyone, regardless of their medical conditions, can feel the impacts of extreme heat. During a heat wave, Boston Emergency Medical Services typically experience a 10% to 15% increase in calls to 911 for people of all ages.

Splash pads are open at parks and playgrounds throughout Boston, and city pools are also open. Boston Public Library locations are also available for residents to seek relief from the heat.

It’s expected to remain warm and humid through the weekend, but it will be unsettled with scattered showers and thunderstorms. Locally heavy downpours will be possible at times.