Los Angeles, CA – Triple-digit heat is locking in across inland valleys and foothills Tuesday afternoon, with temperatures climbing toward 104°F and staying elevated through Friday evening, increasing the risk of heat-related illness across Southern California.
According to the National Weather Service in Los Angeles/Oxnard, an Extreme Heat Warning remains in effect until 8 p.m. Friday for much of Los Angeles and Ventura counties, including the San Fernando Valley, Santa Clarita Valley, and inland coastal areas. Daytime highs between 96 and 104 degrees are expected, with the hottest conditions focused in Woodland Hills, Northridge, Pasadena, and Santa Clarita.
Overnight lows will remain unusually warm, especially in foothill and mountain communities, limiting the body’s ability to recover from daytime heat. This prolonged exposure increases risk for those without access to air conditioning, as well as outdoor workers and vulnerable populations.
High-impact areas include the Interstate 5 corridor through the Grapevine, Highway 14, and dense urban zones like downtown Los Angeles, where heat can intensify due to urban infrastructure.
Residents are urged to stay hydrated, avoid outdoor activity during peak afternoon hours, and check on neighbors. The heat will persist through Friday evening, and additional alerts could be issued if conditions extend into the weekend.
