 Monday gets even hotter with highs around 100 degrees and heat index values as hot as 110. I'm 7 News Meteorologist Mark Pena in the First Alert Weather Center. 81 degrees at Tyson, 78 in Waldorf, and 84 degrees on LaFont Plaza. Coming up, brought to you by Gutter Helmet. Call DC's exclusive Gutter Helmet dealer to schedule your free gutter assessment and estimate. 888-5-HELMET.