Yesterday was the tenth day in a row that DC saw 95+ degrees. A record. This article goes into good detail on the records DC hit yesterday. It's certainly been challenging to go running in this heat so I've spent a bit more time at the gym on the bike and weights.
It appears the heat wave will break tomorrow and we'll get back down into the 80s. Good timing as Chicago is in exactly two weeks from today. I'm looking forward to some cooler evenings to go on longer runs.