Extreme Heat Warning for San Juan and Vicinity, Puerto Rico
If you are in immediate danger, call emergency services now.
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Areazine synthesizes this NWS weather alert directly from NOAA's official public data feed. See our methodology for full source attribution and refresh cadence.
An Extreme Heat Warning is in effect for portions of Puerto Rico from 10 AM to 5 PM AST today, with Saharan Dust also present.
Read this weather record in 30 seconds
- Record type
- Extreme Heat Warning
- Affected area
- Puerto Rico
- Issued
- September 11, 2026
- Issuing authority
- NWS San Juan PR
Heat notices are time-bound and location-specific. Confirm the current forecast and local public-health guidance before relying on this archived record.
Record status: publication date is recent, but current status is not stored on this page. Check the issuing agency's live warning service before acting because warnings can be updated, narrowed, or cancelled.
Alert Details
Extreme Heat Warning issued by NWS San Juan PR. Effective from 10 AM AST September 11 to 5 PM AST September 11.
Affected Areas
Portions of Puerto Rico, particularly across coastal and urban areas and lower-elevation valleys. Specific areas include San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez and Vicinity; Southwest.
What You Should Do
Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. 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.
Expected Conditions
This level of heat can affect anyone without effective cooling and/or adequate hydration. High concentrations of Saharan Dust will also be present today, resulting in hazy skies, reduced visibilities and deteriorated air quality.
Timeline
Alert effective from 10 AM AST to 5 PM AST on September 11. Onset at 10 AM AST, expires and ends at 5 PM AST.
Original source: NOAA Official Notice ↗
Related Weather Alerts
All Weather Alerts →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this NWS weather alert: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,242 characters here).
Similar severity timing
Same severity (high) notices issued closest in time to September 11, 2026.
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