The freeway closure caused headaches for motorists who sat in traffic for hours.
Caltrans said the freeway opened again at about 11:30 p.m.
NB I-5 open from earlier mudslide. Quick work @CaltransDist7 crews. Drive carefully!!— Caltrans District 7 (@CaltransDist7) December 14, 2015
The National Weather Service said some areas received a half inch of rain on Sunday.
A mudslide closed the 5 Freeway in both directions on Oct. 15 after nearly 3 inches of rain fell in the area.