With temperatures in the mid to high 90s, the heat indices could hit triple digits this weekend — a month before summer even begins.

WILMINGTON — Heading into the holiday weekend, “Heat index values could reach 100 degrees Friday through Tuesday,” according to the National Weather Service.

Coastal areas will be slightly — but just slightly — cooler, with temperatures in the low to mid-90s while inland regions can expect a high around 99 degrees on Sunday.

During periods of extreme heat, there are concerns for people spending time outside as well as pets and animals.

“Heat can be a silent killer because it doesn’t topple trees or rip roofs off houses like tornadoes and hurricanes,” Eli Jacks, chief of fire and public weather services with NOAA’s National Weather Service said in a prior press release. “Nevertheless, it’s a dangerous weather condition for which people should prepare.”

NOAA also recommends wearing light and loose-fitting clothing, avoiding strenuous activities outside, and drinking plenty of water to combat the heat.

NOAA also offers some dos and don’ts for periods of high temperatures.

Do:

• Do – Slow down, and reduce strenuous activity. Mow the lawn or garden in the early morning or late evening instead of midday.
• Do – Dress in lightweight, nonrestrictive, light-colored clothing.
• Do – Drink plenty of water or other nonalcoholic fluids.
• Do – Eat light, easy-to-digest foods.
• Do – Seek out shade if you have to be outdoors for extended periods. Spend more time in air-conditioned places.
• Do – Check on elderly neighbors, friends and relatives to make sure they are okay.
• Do – When outside, take frequent dips in the ocean or pool, or mist yourself with a water bottle. When inside, take frequent cool baths or showers and use cold compresses to cool off.
• Do – Apply high-SPF sunscreen frequently when outdoors.
• Do – Seek immediate medical attention if you experience symptoms of heat illness. (See chart below for symptoms, likely conditions and treatment.)

Do not:

• Do not leave children, the elderly, or pets in the car for any reason, for any length of time. Look before you lock! A dark dashboard or seat can easily reach temperatures in the range of 180 to more than 200 degrees F!
• Do not stay in the sun for long periods.
• Do not take salt tablets unless directed by a physician.
• Avoid alcoholic beverages; they can dehydrate you and increase your risk of heat stroke and other potentially fatal heat-related illnesses.