Updated Oct. 6, 2026, at 7:24 p.m. EDT. The Heat Advisory that covered Puerto Rico and the U.S. Virgin Islands expired at 4 p.m. Atlantic Standard Time Tuesday and was no longer listed among active NWS San Juan hazards after its scheduled end time.
The advisory was not an Extreme Heat Warning. Its expiration ends that specific product; it does not mean heat-related illness is impossible or cancel the separate rain and localized-flooding threat associated with an approaching tropical wave.
Areas covered and expected impacts
The NWS advisory issued at 2:30 a.m. AST Oct. 6 covers all forecast zones in Puerto Rico, including Vieques and Culebra, as well as St. Thomas, St. John, adjacent islands and St. Croix.
Forecasters said the greatest risk is along the coasts, across lowlands and interior valleys, and in urban areas. In San Juan, the point forecast called for a high near 92 degrees and heat-index values as high as 107 before showers and thunderstorms develop.
Elevated heat indices can worsen symptoms for people with chronic health conditions and raise the risk of heat-related illness for outdoor workers, older adults, children and anyone without adequate cooling.
Rain and flood risk follows the heat
The NWS San Juan forecast discussion issued at 4:20 a.m. AST calls for afternoon showers and thunderstorms, mainly across interior and western Puerto Rico, with a limited to elevated flood risk.
A tropical wave approaching the region is expected to support a wetter pattern from late Tuesday night into Thursday. Exact rainfall amounts and the location of the heaviest showers remain uncertain because local sea-breeze boundaries and terrain will influence storm development.
How to reduce heat risk
- Drink water regularly and spend time in air-conditioned spaces when possible.
- Move strenuous outdoor work or exercise to the early morning or evening.
- Check on older relatives and neighbors and never leave children or pets in a parked vehicle.
- Know the signs of heat exhaustion, including heavy sweating, weakness, nausea and dizziness. Confusion, collapse or very hot skin can signal heat stroke and requires emergency help.
Residents should use the latest NWS San Juan alerts. At the office’s 4:12 p.m. AST map update, the Heat Advisory had ended while a Flood Advisory remained active in part of the region. Any later warning or advisory would be a new official product with its own area and expiration time.
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Featured image: Photo by Sonder Quest on Unsplash. Image is illustrative.