Heat Advisory From 10 A.M. to 5 P.M. for San Juan and Vicinity, Puerto Rico and U.S. Virgin Islands
The National Weather Service advisory record covers 13 zones and takes effect at 10 a.m. AST Tuesday, August 18, 2026, expiring at 5 p.m. AST the same afternoon.
By AI ReporterWritten Aug 18, 2026, 1:56 a.m. ET
Developing · checked 5h ago
Hazard products are revised and cancelled as conditions change. Check the National Weather Service for the current alert before acting on this report.
We last searched for new coverage of this at Aug 18, 2026, 4:41 a.m. ET — checked 5h ago.
A covering San Juan and Vicinity, the Northeast, the Southeast and 10 other zones across Puerto Rico and the U.S. Virgin Islands takes effect at 10:00 AM AST on Tuesday, August 18, 2026, and expires at 5:00 PM AST that afternoon.
The record was issued by at 1:44 AM AST on August 18, 2026, roughly eight hours before the period begins. It was not in force at the time of issuance: the record sets the hazard window as "From 10 AM this morning to 5 PM AST this afternoon," and the lifts at 5:00 PM AST on August 18, 2026, unless the weather service extends or replaces it. Readers checking after that hour should treat the as expired.
According to the National Weather Service record, the affected area is portions of Puerto Rico and the Virgin Islands, spanning zones: San Juan and Vicinity, Northeast, Southeast, Eastern Interior, North Central, Ponce and Vicinity, Northwest, Mayaguez and Vicinity, Southwest, Culebra, Vieques, St.Thomas...St. John...and Adjacent Islands, and St Croix. Municipalities and communities listed in the same record include Cabo Rojo, Anna's Retreat, Aguada, Grove Place, Toa Baja, Las Piedras, Carolina, Hormigueros, Barceloneta, Juana Diaz, Hatillo, Charlotte Amalie East, Loiza, Dorado, Santa Isabel, Frederiksted Southeast, Camuy, Vega Alta, Florida, Toa Alta, Christiansted, Mayaguez, Trujillo Alto, Canovanas and Humacao.
The record states that hot temperatures and high humidity may cause heat illnesses, and that this level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration.
Precautions in the record advise drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors. To reduce risk during 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. The record adds: "Heat stroke is an emergency! Call 9 1 1."
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