Scattered thunderstorms Monday over the mountains and deserts could produce locally heavy rain and flash flooding, the National Weather Service said.
Building high pressure aloft will decrease the shower activity Tuesday and Wednesday, but a return of monsoonal flow is expected for the remainder of the week.
A shallow marine layer along the coast, coupled with higher humidity over the Southwest much of the week, will keep daytime temperatures near, or below average, while overnight lows remain elevated.
High temperatures on Tuesday were predicted to be 75 to 80 near the coast, 82 to 87 inland, 86 to 91 in the western valleys, 90 to 95 near the foothills, 86 to 93 in the mountains and 106 to 111 in the deserts, according to NWS.
A large, south swell has raised the rip current danger risk at area beaches, meteorologists said.