 A warm and muggy night ahead as temperatures fall to the mid-70s with just a few passing clouds. And your Sunday looking hotter than today with mostly sunny skies, temperatures in the mid-90s, and heat index values around 100 degrees. Another chance at some widely scattered afternoon showers that will fizzle out by the time the sun sets tomorrow. I'm 70s meteorologist Mark Pena in the First Alert Weather Center. Right now it is 80 degrees in Reston, 83 degrees in Bethesda, 84 degrees at the National Mall.