Cooler and less humid air is in place and will stay in place through the weekend.  The average high today is 74° at Reagan National, and I think we'll be a few degrees below that this afternoon in the lower 70s.  If you're heading closer to Richmond today, you will run into a few showers. But around the D.C. area, it should be dry, with just passing clouds.  There is a slight chance of a few sprinkles on Sunday, but overall it'll be another pleasant day and primarily dry with highs in the mid 70s.  There's a much better chance of rain late Monday through early Wednesday.