The second in a series of four storms moved over the region Friday morning, bringing drizzle to many areas.
Forecasters warned that the rain would pick up around midday and last through the rest of the day.
Saturday will be even wetter, and Sunday will see the heaviest downpour in the storm series, according to the National Weather Service.
By 8 a.m. Friday, the L.A. Civic Center had recorded .12 of an inch of rain int he past 24 hours, according to the Los Angeles Department of Public Works.
The total in Topanga Canyon was 1.5 inches during the same period, and .67 of an inch was recorded in Malibu.
Along the coast, a high surf advisory is in effect through 1 p.m. on Monday for west-facing beaches in Orange County.
A high surf advisory runs through 10 p.m. Sunday for west-facing beaches in Ventura and Los Angeles counties.
In addition, there is a high risk of rip currents through Friday for the beaches of Ventura, Los Angeles and Orange counties.
Ventura and Los Angeles counties are expected to get waves of six to 12 feet, with local sets up to 15 feet.
The large surf and very strong rip currents will make for dangerous swimming conditions, forecasters warn.
Residents in coastal communities like Seal Beach are bracing for the big waves and high tide, which could cause flooding in streets and houses along the sand.
Seal Beach’s lifeguard department said strong swells are typical at this time of year.
A large sand berm went up in November on the south side of the pier in case of such a scenario. The city also has pumps and sand bags on hand for emergencies.
Last April, an unexpected strong swell flooded the boardwalk after the berm had been taken down.
In 2010, homes in Sunset Beach were filled with water. And back in 2008, streets flooded and Pacific Coast Highway had to be shut down.
After this weekend, high pressure build over the area for the first half of next week, bringing dry conditions and a warming trend.