Motorists may hit pockets of dense fog during their morning commute, according to the National Weather Service.
A dense fog advisory was issued for a second morning in a row Thursday for areas along the coast and in inland valleys.
The advisory was set to expire at 8 a.m. when conditions would clear significantly, according to NBC 7 Meteorologist Sheena Parveen.
The NWS said drivers on Interstate 5 and I-805 will likely see fog. The cities of Vista, Carlsbad, Encinitas, Chula Vista, National City, San Diego, El Cajon, La Mesa may be affected.
Parveen said during that time visibility may drop before a quarter-mile.
Drivers were urged to slow down, use headlights, and leave plenty of space between cars.
A similar weather pattern was expected for several days.
Overnight into Monday, dense fog affected flights at the San Diego International Airport. At least two dozen flights were either delayed or re-routed because of the weather conditions.