Las Vegas is headed for a 112-degree Sunday under an Extreme Heat Warning, with thunderstorms possible after 2 p.m. A hotter-than-normal stretch will ease slightly as monsoon moisture builds midweek.

Downtown Los Angeles could reach 88 degrees Sunday before a gradual cooldown brings low-80s temperatures later this week.

San Diego starts Sunday under coastal clouds before an 81-degree afternoon. Inland heat alerts remain in place as a cooler pattern takes over midweek.