 before more heat by next weekend. I'm 70s meteorologist Brian Vandegraaff in the First Start Weather Center. 89 the reading in Reston, also 89 in Bethesda, and it's 91 degrees on the National Mall. Brought to you by Mervis Diamond Importers. At Mervis, you'll find everything you'd expect from a fine diamond, except the price. Only at Mervis Diamond Importers.