Port Isabel, TX has a humid subtropical climate with hot summers and mild winters. The average temperature in the summer months is around 84°F while the average temperature in the winter months is about 63°F. Rainfall is common throughout the year with an annual average of 35 inches of rain annually. Humidity can be quite high during the summer, with relative humidity levels ranging from 55% to 85%. In the winter, humidity levels are much lower and generally range between 40-50%.
Port Isabel, Texas gets 27 inches of rain, on average, per year. The US average is 38 inches of rain per year.
Port Isabel averages 0 inches of snow per year. The US average is 28 inches of snow per year.
On average, there are 225 sunny days per year in Port Isabel. The US average is 205 sunny days.
Port Isabel gets some kind of precipitation, on average, 73 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.
Weather Highlights
Summer High: the July high is around 91 degrees
Winter Low: the January low is 53
Rain: averages 27 inches of rain a year
Snow: averages 0 inches of snow a year