 Now, it's important to remember your heat safety tips on a day like today, which includes staying plenty hydrated, wearing light-colored, loose-fitting clothing, and taking plenty of breaks in the shade. Especially as we head towards tomorrow, it's only going to get hotter with highs right around 100 degrees and heat index values closer to 110. I'm 7 News Meteorologist Mark Pena in the First Alert Weather Center. 74 in Reston, 76 degrees in Bethesda, 80 degrees on the National Mall.