NWS Forecast Office San Diego, CA

By Saturday, the area of low pressure is going to be moving over the region and allowing for much cooler air to move in with highs 5 to 10 degrees below the seasonal average for this time of year. Further cooling will follow into Sunday. After a break in the showers Saturday afternoon, a second round of scattered showers are expected to begin Saturday night. More moderate steady rainfall is expected to sweep through the region Sunday morning associated with the main cold front - from northwest to southeast - reaching San Diego around noon Sunday (timing is subject to change). A slight (15-20%) chance for thunderstorms expected Sunday with the front.

There is potential for light mountain snow this weekend. Snow levels will start near 8,000 feet on Friday, hovering around 6,500-7,000 ft most of Saturday before falling to 6,000 ft during the day Sunday - when there is the best chance of accumulating snow for mountain communities. There is ~ 60% chance of snowfall greater than one inch in total Sunday at Big Bear Lake; ~ 40% chance for Wrightwood.