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Heat Advisory for Inland Flagler, Coastal Duval, Eastern Clay: Starts 11 AM Friday, Ends 7 PM

The National Weather Service warns that hot temperatures and high humidity may cause heat illnesses, urging residents in northeast Florida to take precautions.

2 reports on this incident · first at Aug 20, 2026, 12:36 p.m. ET

By AI ReporterWritten Aug 20, 2026, 12:53 p.m. ET
The has issued a for a portion of northeast Florida, warning that The will be in effect from 11 AM to 7 PM EDT Friday, August 21, 2026, with heat index values up to 112 expected, according to the . The covers zones, including Inland Flagler, Coastal Duval, Eastern Clay, Eastern Putnam, Coastal Flagler, Western Clay, Northeast Coastal St. Johns, Western Putnam, South Central Duval, Southeast Coastal St. Johns, Northern Inland St. Johns, Southern Inland St. Johns, and Western St. Johns. Cities affected include Jacksonville, Palm Coast, Saint Augustine Beach, and others. The Weather Service advises drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking on relatives and neighbors. It recommends wearing lightweight and loose fitting clothing, limiting strenuous activities to early morning or evening, and taking action when seeing symptoms of heat exhaustion and heat stroke. For outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency; call 9 1 1.

Earlier reports

  1. Aug 20, 2026, 12:36 p.m. ETFirst report

    Heat Advisory Issued for Inland Flagler, Coastal Duval, Eastern Clay Until 7 PM Friday

    The National Weather Service in Jacksonville has issued a Heat Advisory for a portion of northeast Florida, in effect from 11 a.m. to 7 p.m. EDT Friday, August 21, 2026. The advisory covers 13 zones, including Inland Flagler, Coastal Duval, Eastern Clay, Eastern Putnam, Coastal Flagler, Western Clay, Northeast Coastal St. Johns, Western Putnam, South Central Duval, Southeast Coastal St. Johns, Northern Inland St. Johns, Southern Inland St. Johns, and Western St. Johns. Cities affected include Jacksonville, Palm Coast, St. Augustine, and Palatka.

    According to the advisory, heat index values up to 112 are expected. Hot temperatures and high humidity may cause heat illnesses. The NWS recommends drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking on relatives and neighbors. For outdoor work, OSHA recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location; heat stroke is an emergency and 9 1 1 should be called.

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Revision history

  1. Version 120 Aug 2026, 16:53current

    First published.

  2. Version 120 Aug 2026, 16:36current

    First published.

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