Washington, D.C. Weather Forecast: Day 2 of the Heat Wave, 2 More to Go

Humidity is higher and Dulles Record High Temperature in Jeopardy. This Afternoon: Mostly Sunny Highs: Low to Mid 90s Heat Index: 94-98 Tonight: Evening Thunderstorm, Partly Cloudy Lows: Low 70s Precipitation: 25% Wednesday: Mostly Sunny, Reported by CapitalBay 3 hours ago.