Fog shrouds ships at Naval Base San Diego is this file photo from the Navy.
Fog shrouds ships at Naval Base San Diego is this file photo from the Navy.

A dense fog advisory was in effect Monday in San Diego County’s coastal areas, where visibility was down to a quarter-mile or less in places.

The National Weather Service issued the advisory until 9 a.m., saying areas within 10 miles of the coast were affected, including Interstate 5 and parts of Interstate 8, Interstate 15 and state Route 163.

“If driving, slow down, use low beam headlights and leave plenty of distance ahead of you,” the weather service urged.

After the fog clears, the forecast calls for highs 63 to 68 near the coast and 69 to 74 inland with light winds.

City News Service contributed to this article.

Chris Jennewein is founder and senior editor of Times of San Diego.