From this map, maintained by the California Department of Transit/CALTRANS, you can get real-time updates on the traffic around San Diego. It shows the speed of every San Diego freeway and is updated very often. It also has links to more details, such as fire-related road closures.
Once you open the CalTrans interactive map, open the page, be sure to choose both the highway and direction for a detailed update. For example, this morning if you had selected Highway 5 South, you would have seen that the freeway was closed. The Pendleton fire has since been put out.