Excessive heat warnings are in effect across Southern California, particularly in the Inland Empire, with temperatures expected to reach as high as 117°F in areas like Palm Desert and Coachella until Friday. Forecasters have indicated dangerously hot conditions, advising residents to stay hydrated and avoid outdoor activities during peak heat hours. San Diego County is also under heat advisories, anticipating triple-digit temperatures, with a record minimum temperature recently reported in Borrego. Meanwhile, coastal regions will experience milder conditions, with highs ranging from the upper 60s to low 80s. An increase in monsoonal moisture could lead to afternoon thunderstorms in the mountains early next week. Overall, the region is bracing for a significant heat wave, with officials stressing the importance of safety measures for vulnerable populations, including children and pets.