From Rusty Garrett:
The second of two cold fronts will make its way into Central Texas overnight, helping to reinforce cooler air that's already in place.
Calm winds ahead of the front increase slightly to 5-15 mph behind the front. Despite the fact that a front moves through, morning low temperatures Thursday will be quite similar to Wednesday morning's lows in the middle and upper 50s. A few spots near I-45 may remain in the lower 60s Thursday morning.
You'll notice the increase in winds Thursday afternoon, sustained from the north between 10 and 15mph, with gusts to near 20mph at times. Sunny skies rule over Central Texas with Thursday afternoon high temperatures only reaching the middle and upper 70s. Winds will relax by Friday morning, allowing morning lows to drop into the low 50s in rural areas and middle 50s in the cities.