Crowds...definitely less of a problem than almost any other time of year. Weather...can't tell. By the standards of most of the nation, So Cal virtually never has really bad weather! In early Feb, it often is gorgeous, with blue skies and crisp, clear days in the 60's or low 70's. It might be same temps and overcast most of the day. And it might be raining; that is one of the times most likely to have rain; if it does rain, the chances would be for several days of rain (not just a passing storm for a couple of hours). Good luck deciding!