As triple-digit heat sets in, local officials are warning residents in the greater Boston area to practice safety precautions during the heat emergency.

“Symptoms of heat illness can occur quickly and affect people of all ages, so it’s especially important to plan ahead,” said Mayor Michelle Wu. “Please stay hydrated, use city cooling resources, and check in on family, friends, and neighbors, especially older adults, young children, and those with underlying health conditions.”

Between Wednesday and Friday, temperatures are expected to reach from the high 90s to low 100s – while heat indices may climb up to 112 degrees in the Boston area.

The National Weather Service has issued an extreme heat warning through the evening Saturday for all of Massachusetts, as well as parts of Connecticut and Rhode Island. The forecasters warn residents of high potential for heat-related illnesses, encouraging precautions like drinking plenty of fluids, remaining in A/C, staying out of the sun and checking in on relatives and neighbors.

The city of Boston, as well as towns and cities across Massachusetts, has deployed heat emergency resources, listed at boston.gov/heat.

Cooling centers across the city include BCYF centers, public libraries, cultural institutions like the Museum of Science, ICA, Kennedy Institute for the United States Senate, and Kennedy Presidential Library that will be free during the emergency, public pools and splashpads and more.

Boston EMS is expecting at 10-15% increase in 911 calls for people of all ages, city officials stated. The city urged residents to sign up for emergency alerts through AlertBoston to receive information about dangers, safety tips and resources.

Officials also encouraged residents to follow safety tips, including drinking plenty of fluids that are not alcoholic and high in sugar or caffeine, take frequent cold showers, take breaks in shade, wearing sunscreen, wearing loose-fitting protective clothing, plugging A/C units and fans directly into a wall outlet to avoid electrical fires, swimming with lifeguards present, and checking on neighbors, especially older adults and those with disabilities.

Warning signs of heat-related illness may include dizziness, nausea, confusion, heavy sweating, muscle aches, or cool and clammy skin. Those experiencing persistent symptoms should call 911 immediately and not delay care, city officials said, noting heat is the leading cause of weather-related deaths in the U.S.

The Age Strong Commission also offers discounted taxi vouchers for older adults in need of help getting to a cooler space, with more information through the number 617-635-4366.

For those experiencing homelessness, the shelter Pine Street Inn encourage people to come into around-the-clock cooling centers for safe place to stay. The Boston Public Health Commission also offers emergency shelters for those in need.

If residents see an individual experiencing homelessness or otherwise out in the heat who appears immobilized or disoriented, city officials encouraged anyone to call 911.

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Children may be at greater risk in hot weather, the city stated, and along with pets, should never be left in cars for any length of time. Adults can visit boston.gov/cool-kids for heat safety advice for children.

Boston officials noted that outdoor fires are banned in Boston, including fire pits, chimineas, and bonfires, and grills should be kept away from buildings, well-ventilated and always attended.

More information on resources available and precautions is available at boston.gov/heat or by calling 311.