The National Weather Service's forecast has temperatures reaching 98 degrees with a 20 percent chance of rain.
Winds from the south will be 10 to 20 mph.
Goliad will be under a heat advisory with the heat index expected to reach 110 degrees.
Humidity is expected to be 59 percent during the daylight hours and 81 percent Tuesday evening.
The low temperature is expected to be 75 degrees.