"I was hoping it was going to be at least high 70s, low 80s so we can be out here in our swimsuits, but it's just a little breezy, so I had to bring my little sweater," said Kendra Vinson, who was in Santa Monica visiting from North Carolina.
Rough and possibly dangerous water conditions may put a damper on beachgoers as well.
If you're planning on braving the cold and venturing out into the water, emergency officials say you should be aware of strong rip currents. They are advising people to swim where a lifeguard tower is visible.
If you're caught in a rip current, swim along the shore until you're free of the current. Then, make your way back to shore.
In Big Bear, the temperature dipped to 28 degrees and the ski resort got a good dusting of snow.