Severe Heatwave ● Closed
Extreme Heat Warning issued September 7 at 2:39AM AST until September 7 at 5:00PM AST by NWS San Juan PR, United States of America
Loading live data… · Marker positions are approximate; severity is labelled in each popup. Sources: USGS, GDACS, NASA EONET, NOAA/NWS, EMSC.
* WHAT...This level of heat can affect anyone without effective
cooling and/or adequate hydration.
* WHERE...Portions of Puerto Rico, particularly across coastal and
urban areas and lower-elevation valleys.
* WHEN...From 10 AM this morning to 5 PM AST this afternoon.
* IMPACTS...Heat-related illnesses increase significantly during
periods of very high heat indices or high temperatures. This
extreme heat event poses a severe threat to anyone with inadequate
cooling or hydration. These extreme impacts will be most pronounced
across coastal sections, lowlands, interior valleys, and urban
areas.
* ADDITIONAL DETAILS...Although passing showers, t-storms and clouds
can provide some relief, enough sunshine and moisture is expected
for heat indices to reach dangerous levels.
Measurements
| Coordinates | 39.9645, -100.8105 |
|---|---|
| Region | San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez a |
| Location Precision | country |
| Issuing Authority | United States of America — us-noaa-nws-en |
| Cap Urgency | Expected |
| Cap Certainty | Likely |
| Cap Expires | 2026-09-07T17:00:00-04:00 |
Official source
Warnings courtesy of the issuing national meteorological service, via the WMO Alert Hub.
This is an official warning issued by the authority named above. Follow its instructions and those of your local emergency services.
Severity as published by WMO Alert Hub (national weather services).
View original reportAlso reported by: WMO
This event as JSON · API and licence
Source updated 42 days ago (Sep 7, 2026 06:40 UTC) · we last heard from WMO Alert Hub (national weather services) 8 seconds ago
On a slow connection? Low-bandwidth version — no map, no scripts, under 14 KB.
About this location
The agency did not publish coordinates for this warning. The pin is the centre of the country, not the location of the event — read the area name, not the map, for where it applies.
Area as the agency stated it: San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez a
Official authorities in United States
If you are there, these are the bodies whose instructions apply. This site is not an emergency service and does not issue warnings.
More for United States →What to do
Follow the instructions issued by WMO Alert Hub (national weather services) and your local emergency services. The guidance below is background.
Recognising heat exhaustion and heat stroke, keeping cool, and protecting vulnerable people during extreme heat.
Open Heatwave Safety Guide →Nearby & related events
Disclaimer: figures are automatic feeds from the named agencies and may be revised. Do not use this page for life-safety decisions — follow official local emergency services.