A flash flood watch for Riverside County valleys, mountains and desrts was expected to remain in effect until midnight, according to the National Weather Service.
"Monsoonal moisture and daytime heating will continue to bring scattered thunderstorms," to all of southwest California, NWS advised.
"Locally heavy rainfall and flash flooding are possible," NWS stated.
"You should monitor later forecasts and be prepared to take action should flash flood warnings be issued," NWS advised residents and motorists.
Read all weather statements in effect for Murrieta by clicking here.