Hurricane Ileana and other storms prompted National Weather Service officials to issue a high surf advisory, to be in effect from Friday to 6 p.m. Monday.
"Surf is expected to peak Saturday and Sunday," the advisory said.
Waves may reach 6 to 9 feet in some areas and up to 10 feet for south facing beaches. Dangerous rip currents are also possible.
The swell also may impact the Imperial Beach shoreline, which was closed Tuesday due to a less than a mile south of the U.S.-Mexico border. The spill has not affected Coronado.
The spill continues, said Mark McPherson with the San Diego County Department of Environmental Health.
At an estimated flow of 70 liters a second, about 4.6 million gallons of untreated sewage have flowed into the Pacific Ocean from Playas de Tijuana.
“Closures will remain in place at least until sewage has stopped, but most likely a little longer especially with the current pushing north," he said. "I can't really predict what's going to happen with the weekend.”
Water quality samples taken by environmental health employees found signs of the spill near the border but not in Imperial Beach.