A trough pattern over the West is responsible for the cooling trend that's occurred over the last several days and even the drizzle that came over the weekend at times. While a series of low pressure systems continue to move east and out of the region, it will still take some time for a ridge of high pressure to build in its place. When it does, however, a notable but brief warming trend will be felt over the course of the weekend before we cool again into next week. https://www.cbs8.com/article/news/local/san-diego-weather-update/509-addbcd08-0811-489a-b511-7cd202ccde99