Weather Alerts For Walnut, CA

# HEADLINE -------------------- EXTREME HEAT WARNING IN EFFECT FROM 10 AM FRIDAY TO 8 PM PDT SUNDAY # DETAILS -------------------- WHAT Dangerously hot conditions with temperatures of 95 to 110 expected. WHERE A large portion of southwest California including the coastal ranges and adjacent foothills, as well as the coastal valleys. WHEN From 10 AM Friday to 8 PM PDT Sunday. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ADDITIONAL DETAILS Heat hazards may extend into next week for portions of the region. ISSUED AT Tuesday, July 28, 2026 at 9:57 AM PDT ISSUED BY National Weather Service Los Angeles/Oxnard CA HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- 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. Car interiors will reach lethal temperatures in a matter of minutes. 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. To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. Heat stroke is an emergency! Call 9 1 1. Stay cool, stay hydrated, stay informed. Monitor the latest forecasts and warnings for updates. If you do not have air conditioning in your home or lack shelter, you can call 2 1 1 for assistance locating appropriate shelter from the heat. # AREAS AFFECTED -------------------- Eastern Santa Monica Mountains Recreational Area, Southern Ventura County Mountains, Calabasas and Agoura Hills, Central Ventura County Valleys, Cuyama Valley, Eastern San Fernando Valley, Lake Casitas, Los Angeles County Inland Coast including Downtown Los Angeles, Los Angeles County San Gabriel Valley, Ojai Valley, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Barbara County Interior Mountains, Santa Clarita Valley, Santa Susana Mountains, Santa Ynez Mountains Eastern Range, Santa Ynez Mountains Western Range, Southeastern Ventura County Valleys, Southern Salinas Valley, Ventura County Inland Coast, Western San Fernando Valley, Western Santa Monica Mountains Recreational Area Including the cities of Shandon, Piru, Oak View, Beverly Hills, Newbury Park, Atascadero, Caliente Range, Creston, Universal City, Templeton, Culver City, Moorpark, Santa Margarita Lake, Camarillo, San Miguel, East Los Angeles, La Panza Range, San Marcos Pass, Simi Valley, Meiners Oaks, Montecito Hills, Glendale, Westlake Village, Big Pine Mountain, Chatsworth, Malibu Bowl, Sunland, Topatopa Mountains, Downey, Hollywood, Lake Castaic, Valencia, Santa Paula, Malibu Lake, Ojai, Northridge, Burbank, Fillmore, Oat Mountain, Norwalk, Figueroa Mountain, Paso Robles, Topanga, New Cuyama, San Rafael Mountain, East Ventura, Thousand Oaks, Newhall, Santa Clarita, Carrizo Plain, Compton, Woodland Hills, Rose Valley, La Canada Flintridge, El Monte, Pomona, San Gabriel, Pasadena, Lake Nacimiento, Matilija, and Van Nuys