Heat Advisory Extended for Puerto Rico and U.S. Virgin Islands
The National Weather Service San Juan PR has extended a Heat Advisory on August 16, 2026, to run through 5:00 PM AST.
4 reports on this incident · first at Aug 16, 2026, 1:30 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 16, 2026, 1:40 a.m. ET
Heat Advisory Takes Effect at 10 AM AST Sunday for Puerto Rico and U.S. Virgin Islands
A Heat Advisory issued by the National Weather Service San Juan PR is scheduled to begin later this morning, not yet in force at the time of writing. According to the official National Weather Service alert record, the advisory takes effect at 10:00 AM AST on August 16, 2026 and lifts at 5:00 PM AST the same afternoon. The record describes the period as "From 10 AM this morning to 5 PM AST this afternoon." After 5:00 PM AST on August 16, the advisory has expired.
The advisory covers 13 zones across portions of Puerto Rico, Vieques, Culebra, and the U.S. Virgin Islands, including 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.
The official record states that hot temperatures and high humidity may cause heat illnesses. This level of heat affects most individuals sensitive to heat, especially those without effective cooling or adequate hydration. Affected cities listed in the record include Carolina, Ceiba, Mayaguez, Las Piedras, Lajas, Loiza, Rio Grande, Charlotte Amalie East, Guanica, Charlotte Amalie West, Anna's Retreat, Juncos, Penuelas, Santa Isabel, Ponce, Manati, Toa Alta, Aguadilla, Trujillo Alto, Yauco, Florida, Patillas, Comerio, Rincon, and Cruz Bay.
Precautions listed in the official record advise drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, and checking up on relatives and neighbors. The record also advises taking extra precautions when outside, wearing lightweight and loose fitting clothing, trying to limit strenuous activities to early morning or evening, and taking action when symptoms of heat exhaustion and heat stroke appear — guidance aimed at the seven-hour window between the 10:00 AM AST start and the 5:00 PM AST expiration.
Aug 16, 2026, 1:34 a.m. ET
National Weather Service Warns High Humidity and Heat May Cause Heat Illnesses
Hot temperatures and high humidity may cause heat illnesses, according to official advisory records from the National Weather Service San Juan PR. The agency noted that this level of heat affects most individuals sensitive to heat, especially those without effective cooling and or adequate hydration. The Heat Advisory applies to portions of Puerto Rico, Vieques, Culebra, and the U.S. Virgin Islands across 13 zones. The advisory window begins at 10:00 AM AST on Aug. 16, 2026, and expires at 5:00 PM AST the same afternoon. Official records 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. Guidance from the agency also recommends taking extra precautions when outside, 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.
Aug 16, 2026, 1:30 a.m. ETFirst report
National Weather Service Issues Heat Advisory for Puerto Rico and U.S. Virgin Islands
The National Weather Service San Juan PR has issued a Heat Advisory for portions of Puerto Rico, Vieques, Culebra, and the U.S. Virgin Islands on August 16, 2026. The situation is developing. The advisory starts at 10:00 AM AST on August 16, 2026, and expires at 5:00 PM AST on August 16, 2026.
According to official National Weather Service bulletins, the advisory covers 13 zones, including 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. Cities listed in the advisory include Carolina, Ceiba, Mayaguez, Las Piedras, Lajas, Loiza, Rio Grande, Charlotte Amalie East, Guanica, Charlotte Amalie West, Anna's Retreat, Juncos, Penuelas, Santa Isabel, Ponce, Manati, Toa Alta, Aguadilla, Trujillo Alto, Yauco, Florida, Patillas, Comerio, Rincon, and Cruz Bay.
Official bulletins warn that hot temperatures and high humidity may cause heat illnesses, affecting individuals sensitive to heat, especially those without effective cooling or adequate hydration. Recommended precautions include drinking plenty of fluids, staying in an air-conditioned room, staying out of the sun, checking on relatives and neighbors, wearing lightweight and loose-fitting clothing, limiting strenuous activities to early morning or evening, and taking action if symptoms of heat exhaustion or heat stroke occur.
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- Version 116 Aug 2026, 05:50current
First published.
- Version 116 Aug 2026, 05:34current
First published.
- Version 116 Aug 2026, 05:30current
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- Version 116 Aug 2026, 05:40current
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