Weather alert: Rain or not, Miami under a new advisory. How hot will it get?

Despite afternoon rain, South Florida will have to deal with the heat again.

And that heat will be intense enough for the National Weather Service to issue an advisory for Friday, the fifth straight this week.

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The heat advisory is in effect for Miami-Dade and Broward counties from 11 a.m. to 6 p.m. Friday.

“We’ll be cranking that air conditioning,” Lissette Gonzalez, a meteorologist with Miami Herald news partner CBS News Miami, said Friday morning. “And take your umbrella.”

The feels-like temperatures, which take into account humidity, will reach as high as 107 degrees, according to the weather service. At 5 a.m., parts of South Florida already felt like more than 90 degrees, when humidity is considered.

The afternoon high temperature will rise to 91, a few degrees cooler than the past few days in South Florida. Wednesday’s high reached the mid-90s and Tuesday hit 100 in Miami, which hadn’t happened since 1942.

The heat “won’t be as oppressive” on Friday, Gonzalez said.

Forecasters expect rain in the afternoon and into the evening.

“That will bring some relief for us,” Gonzalez said.

The rain chance on Friday is 30%, and the low temperature at night will drop to 80.

That pattern will continue on Saturday and Sunday and into next week with similar temperature range and rain chances, according to the National Weather Service.

What is a heat advisory?

The National Weather Service in Miami issues a heat advisory if the heat index is 105 degrees for at least a couple of hours. Before 2023, the weather service issued a heat advisory when the heat index hit 108 degrees. The goal is to spread awareness so that people protect themselves from extreme heat that leads to more than 30 deaths and hundreds of hospitalizations every year, according to county estimates.

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What is the heat index?

The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature, according to the weather service. This is how hot it “feels like” on your skin on steamy days.

What to know about heat illness

Miami-Dade County has issued several hot weather survival tips, based on U.S. Centers for Disease Control and Prevention advice, and noted who is most at risk:

Who is most at risk of heat-related illnesses:

Older adults 65 and older, young children, people with chronic health conditions or mental illness, athletes who exercise outdoors, outdoor workers, people living unsheltered or with limited access to air conditioning, pregnant people, and pets.

What you should do:

▪ Stay cool by spending time in air-conditioned buildings.

▪ Avoid direct contact with the sun.

▪ Reduce physical activity and move to shaded areas.

▪ Do outdoor activities in the cooler morning or evening hours, and dampening your shirt or wrapping a wet scarf or bandana around your neck or forehead could also help.

▪ Stay hydrated and drink plenty of water or drinks with electrolytes if you’re sweating. Don’t wait until you’re thirsty to drink more. Use sunscreen, too, to protect against skin damage.

▪ Limit or avoid dehydrating caffeine and alcohol.

▪ Never leave infants, children or pets in a parked car, even if the windows are cracked open.

▪ Watch for signs of heat exhaustion or heat stroke. Seek medical care immediately if you know someone who experiences symptoms that could include high body temperature, headache, dizziness or nausea and confusion.

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This story was originally published August 21, 2026 at 5:13 AM.