The Los Angeles County Fire Department's Lifeguard Division announced the temporary shutdowns, which included Redondo Beach, shortly before 10 a.m.
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"Lifeguards are clearing the water and advising patrons on the beach to seek shelter," the agency said on Twitter, adding that lifeguards were working with the National Weather Service to monitor the storm cell.
There were no immediate reports of injuries or damage due to the lightning.
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"A stubborn area of low pressure aloft will likely linger of the region through the remainder of the week, and keep a showery and unsettled weather pattern in place," according to the Weather Service. Night through morning low clouds and fog are likely to continue through the week.
Forecasters noted that the unstable weather system will "threaten the area with thunderstorms and locally heavy rain."