San Diego County Issues Extreme Heat Alert

San Diego County officials warned of an extreme heat episode that could push interior valley temperatures above 100°F, with mountain areas reaching 90°F and coastal zones staying near 80°F. The National Weather Service forecast high nighttime temperatures as well.

Authorities urged residents to stay hydrated, avoid prolonged sun exposure, and remain in air‑conditioned spaces during peak heat hours. The county highlighted its "Cool Zones"—public buildings such as libraries and community centers equipped with air conditioning—where people can seek refuge. Vulnerable populations, including children, older adults, pregnant people, those with chronic illnesses, and outdoor workers, were specifically advised to take precautions.

The alert also mentioned a potential increase in hydrogen sulfide emissions near the Tijuana River Valley, recommending limited outdoor activity if a strong egg‑like odor is detected and advising ventilation of indoor spaces. For signs of heat‑related illness—confusion, dizziness, nausea—residents were told to call 911, move the person to a cool area, and apply cold water.

Pet owners received guidance to keep animals in shaded, cool environments, provide fresh water, avoid walks during the hottest periods, and never leave pets in parked vehicles, as interior temperatures can rise rapidly even with windows open.