 And later on tonight, skies will be mostly cloudy through these off and on showers and thunderstorms. Low eventually dropping to about 77. Tomorrow, the excessive heat warning lasts until 8 p.m. Mostly sunny much of the day. High near 95. Heat index values as high as 103. With a chance of late-day showers and thunderstorms, some of which could be heavy. More potential severe weather tomorrow night. Mostly cloudy. Low of 73.