Sergio is churning off the coast of Mexico, bringing dangerous surf conditions until Friday, according to the National Weather Service.
Some minor coastal flooding is expected at south-facing beaches, from Oxnard all the way down to San Diego.
Hazardous surf conditions will likely last through at least Thursday night. Estimates of surf heights are 5 to 8 feet with sets to 10 feet during the peak of the event.
The NWS said surf should begin to subside Friday night, but there is a chance that dangerous rip currents could linger into Saturday.
City News Service contributed to this report.