Mild and muggy conditions can be expected on Sunday morning.
Temperatures quickly soar to the 90s by Noon with heat index temperatures in the triple digits.
There is a slight chance for a brief shower or thunderstorm during the afternoon; otherwise, skies will be partly cloudy.
Meanwhile, high temperatures range from the upper 90s along the coast to the 100s in the mid and upper Valley.
The heat index temperatures peak from 109 degrees in Brownsville to 113 degrees in McAllen.
Stay hydrated and limit outdoor activities during the middle of the day.