The Brief Wednesday marks the third straight day of 100+ degree heat in DFW, with heat index values reaching up to 108. Temperatures will climb to 105 degrees on Friday under a persistent heat dome, just shy of record highs. Extreme summer heat continues to grip North Texas this week, with temperatures expected to peak near record highs on Friday before a brief cold front brings a mild reprieve over the weekend. Triple-digit heat continuesWednesday marks the third consecutive day of triple-digit temperatures across the Dallas-Fort Worth area, with highs reaching 101 degrees and heat index values climbing as high as 108 degrees. Lower humidity and morning temperatures in the 70s will offer a roughly 36-hour window of cooler conditions, with Sunday afternoon highs near the seasonal normal of 97 degrees.