Southern California is baking under a powerful heat wave this week, prompting urgent warnings for more than 8 million people to limit time outdoors and stay cool. The National Weather Service (NWS) extended its heat advisory through 9 p.

The heat advisories extend from Santa Ynez southeast through the French Valley, encompassing more than 8 million Californians. This week's heat wave comes after a period of below-average temperatures, meaning that the rising temperatures might feel particularly warm.

Much of Southern California has been placed under a heat advisory Tuesday as the first of a dayslong heatwave arrives. Henry DiCarlo has KTLA's forecast on Tuesday, May 20, 2025.