San Juan, Puerto Rico
Regional Weather Alerts
| Alert: | Extreme Heat Warning |
| Area(s): | San Juan and Vicinity; Northeast; Southeast; Eastern Interior; North Central; Central Interior; Ponce and Vicinity; Northwest; Western Interior; Mayaguez and Vicinity; Southwest |
| Effective: | 2026-09-06 @ 1:09 am -> 2026-09-06 @ 4:00 pm |
| Onset: | 2026-09-06 @ 9:00 am -> 2026-09-06 @ 4:00 pm |
| Severity: | Severe |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Juan PR on 2026-09-06 @ 1:09 am |
| Headline: | Extreme Heat Warning issued September 6 at 2:09AM AST until September 6 at 5:00PM AST by NWS San Juan PR |
| Description: |
* 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. |
| Alert: | Heat Advisory |
| Area(s): | Culebra; Vieques; St.Thomas...St. John.. and Adjacent Islands; St Croix |
| Effective: | 2026-09-06 @ 1:09 am -> 2026-09-06 @ 4:00 pm |
| Onset: | 2026-09-06 @ 9:00 am -> 2026-09-06 @ 4:00 pm |
| Severity: | Moderate |
| Certainty: | Likely |
| Urgency: | Expected |
| Issued By: | NWS San Juan PR on 2026-09-06 @ 1:09 am |
| Headline: | Heat Advisory issued September 6 at 2:09AM AST until September 6 at 5:00PM AST by NWS San Juan PR |
| Description: |
* WHAT...This level of heat affects most individuals sensitive to heat, especially those without effective cooling and/or adequate hydration. * WHERE...In Puerto Rico, Culebra and Vieques. In Virgin Islands, St Croix and St. Thomas, St. John, and Adjacent 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. |
