Steve Martin is Harris Telemacher, a wacky television weatherman who thinks his life is perfect except for an erratic relationship with a style-conscious girlfriend (Marilu Henner). Then, one bright and smoggy L.A. day, an electronic freeway sign changes his life, when its advice leads him into a frivolous romance with a young and beautiful blonde (Sarah Jessica Parker) and, ultimately, to true love with the woman of his dreams (Victoria Tennant). Set against the backdrop of Los Angeles, it's the most hilariously romantic L.A. Story you'll ever experience.

In this gentle send-up of life in L.A., a TV weatherman stuck in an unfulfilling relationship and embarrassing job receives a mysterious message from a freeway sign saying the weather will change his life. Soon his life is turned upside down--he loses his job, his agent, his girlfriend, and his reasons not to start living life to the fullest.