Heat Advisory in Effect for All of South Florida Until 7 PM EDT
The National Weather Service Miami FL expects heat index values of 105 to 110 from 11 AM to 7 PM EDT on August 17, 2026.
4 reports on this incident · first at Aug 17, 2026, 12:20 a.m. ET
Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.
Earlier reports
Aug 17, 2026, 12:55 a.m. ET
National Weather Service Issues Heat Advisory for South Florida
The National Weather Service Miami FL has issued a Heat Advisory for all of South Florida, effective on August 17, 2026, from 11 AM to 7 PM EDT.
According to official records from the National Weather Service Miami FL, heat index values of 105 to 110 are expected across 15 zones. The advisory covers Glades, Hendry, Inland Palm Beach County, Metro Palm Beach County, Coastal Collier County, Inland Collier County, Inland Broward County, Metro Broward County, Inland Miami, Dade County, Metropolitan Miami Dade, Mainland Monroe, Coastal Palm Beach County, Coastal Broward County, and Coastal Miami Dade County. Locations within the advisory area include Miami, Boca Raton, Hialeah, Davie, Wellington, Belle Glade, Redland, and Marco Island.
Official records warn that hot temperatures and high humidity may cause heat illnesses. The National Weather Service Miami FL advises people to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Aug 17, 2026, 12:25 a.m. ET
National Weather Service Warns High Heat and Humidity May Cause Illnesses
Hot temperatures and high humidity may cause heat illnesses across South Florida, according to official records from the National Weather Service Miami FL.
The Heat Advisory covers 15 zones across all of South Florida, where heat index values of 105 to 110 are expected on August 17, 2026. The advisory remains in effect from 11 AM to 7 PM EDT.
Official records from the National Weather Service Miami FL advise people to drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors.
Aug 17, 2026, 12:20 a.m. ETFirst report
Heat Advisory Issued for South Florida with Heat Index Up to 110
This is a developing story. Official documentation from the National Weather Service Miami FL states that a Heat Advisory is in effect on August 17, 2026, covering all of South Florida across 15 zones. The advisory window begins at 11 AM this morning and ends at 7 PM EDT this evening. Expected heat index values range from 105 to 110. Affected areas include Glades, Hendry, Inland Palm Beach County, Metro Palm Beach County, Coastal Collier County, Inland Collier County, Inland Broward County, Metro Broward County, Inland Miami, Dade County, Metropolitan Miami Dade, Mainland Monroe, Coastal Palm Beach County, Coastal Broward County, Coastal Miami Dade County, and Far South Miami. Specific locations named within these areas include Hendry Correctional, Davie, Felda, Royal Palm Hammock, Hialeah, Royal Palm Beach, Wellington, Caloosa, Shark Valley Obs Tower, Belle Glade, Marco Island, Redland, Boca Raton, Miami, Lion Country Safari Park, Miccosukee Indian Reservation, Florida Gardens, Mahogany Hammock, Buckhead Ridge, Brighton Seminole, North Blocks Golde, Carol City, Sunniland, East Naples, and Northwest Cape Sable. The National Weather Service Miami FL indicates that hot temperatures and high humidity may cause heat illnesses. Official advice lists precautions including drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors.
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