After a cold morning with lows in the mid to low 20's it will be slow to warm up. High temps along and north of I-10 won't get above freezing today. South of I-10 may get above freezing but for only 1-3 hours. Here's a look at the forecast highs for today.
Also, the air is VERY dry so drink extra water and cover as much skin as possible when you go outside. Covering your head is important as your head is responsable for a large amount of heat loss.