Winter storm brings snow to San Diego mountains Eastbound and westbound Interstate 8 off-ramps to Sunrise Highway are closed due to snow and too much traffic, according to Caltrans San Diego. Author: Teresa Sardina Updated: 12:10 PM PST December 29, 2020 SAN DIEGO COUNTY, Calif. — It's the second day of wintery weather for the mountains after a winter storm brought snow to San Diego's mountains where crews have been plowing snow on Mount Laguna near Julian since Monday. In Mount Laguna, a slight chance of snow showers will remain for Tuesday, according to the National Weather Service. Eastbound and westbound Interstate 8 off-ramps to Sunrise Highway are closed due to snow and too much traffic, according to Caltrans San Diego.