From Sean Bellafiore:
Overnight tonight, southerly winds will latch onto moisture and move it into our area. You might not notice the slight increase in humidity, but you'll notice the warmer start to the day Thursday as a result with morning lows only falling into the low 50s west of I-35 and middle to upper 50s near and east of I-35. Patchy fog may also form during the early morning hours in addition to some clouds moving in by morning too.
Afternoon highs Thursday climb into the lower and middle 80s with afternoon dew points likely in the lower 60s. The afternoon dew points aren't so high that the humidity will be unbearable, but you'll at least notice the extra mugginess in the atmosphere. Skies Thursday are expected to be partly cloudy for much of the day.
Friday morning lows will only fall into the lower and middle 60s thanks to the moisture in place in the atmosphere. By Friday afternoon, highs climb into the lower and middle 80s with a 30% chance of a few scattered rain showers. By Saturday morning, lows will only drop into the middle and upper 60s. Afternoon highs Saturday climb into the middle 80s. A few scattered showers or thunderstorms may form during the late afternoon (with afternoon rain chances near 30%), but better rain chances arrive Saturday night as the cold front approaches.
The cold front should approach our area late Saturday into early Sunday, bringing with it a line of showers and thunderstorms to our area. Scattered showers and thunderstorms approach the area after 8 PM but the line of rain may not enter Central Texas until after midnight. The scattered storms along the front may be strong, possibly producing up to quarter-sized hail and 60 MPH wind gusts. The overall severe weather risk Saturday night is low, however. As the front moves through the area Sunday morning, most of the rain should exit before noon, but a few isolated showers may still form during the afternoon. Cooler air will move in during the afternoon as high temperatures only reach the middle 70s.