Weather Alerts For Saint John, VI

# HEADLINE -------------------- HEAT ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 5 PM AST THIS AFTERNOON # SUMMARY -------------------- San Juan and Vicinity-Northeast-Southeast-Eastern Interior-North Central-Central Interior-Ponce and Vicinity-Northwest-Western Interior-Mayaguez and Vicinity-Southwest-Culebra-Vieques- St.Thomas...St. John...and Adjacent Islands-St Croix- Including the cities of San Lorenzo, Santa Isabel, Anna's Retreat, Naranjito, Cayey, Bayamon, Salinas, Ceiba, Jayuya, Mayaguez, Maunabo, Isabela, Trujillo Alto, Yabucoa, Manati, Maricao, Barceloneta, Rio Grande, Coamo, Adjuntas, Frederiksted, Culebra, Fajardo, Humacao, Florida, Las Marias, Vega Baja, Ciales, Juana Diaz, Guaynabo, Toa Alta, Vega Alta, Morovis, Caguas, Utuado, San Sebastian, Hormigueros, Loiza, Camuy, Arroyo, San Juan, Canovanas, Quebradillas, Luquillo, Las Piedras, Sabana Grande, Rincon, Guayanilla, Villalba, Guanica, Juncos, Charlotte Amalie West, Penuelas, Hatillo, Christiansted, Aibonito, Charlotte Amalie, Gurabo, Grove Place, Patillas, Moca, Cidra, Carolina, Catano, Charlotte Amalie East, Arecibo, Dorado, Anasco, San German, Vieques, Cabo Rojo, Toa Baja, Lajas, Aguada, Barranquitas, Cruz Bay, Aguas Buenas, Yauco, Comerio, Orocovis, Aguadilla, Lares, Ponce, Guayama, Frederiksted Southeast, Corozal, and Naguabo 219 AM AST Sat Sep 5 2026 # DETAILS -------------------- WHAT This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. WHERE Portions of Puerto Rico and Virgin Islands. WHEN From 10 AM this morning to 5 PM AST this afternoon. IMPACTS High temperatures or elevated heat indices can worsen symptoms in people with chronic conditions. They can also increase the risk of heat-related illness among individuals sensitive to heat with inadequate cooling or hydration. These risks are highest across coastal areas, lowlands, interior valleys, and urban zones. ISSUED AT Saturday, September 5, 2026 at 2:19 AM AST ISSUED BY National Weather Service San Juan PR HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Take extra precautions when outside. Wear lightweight and loose fitting clothing. Try to limit strenuous activities to early morning or evening. Take action when you see symptoms of heat exhaustion and heat stroke. 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. Heat stroke is an emergency! Call 9 1 1.