I live outside of Houston and there are many places hotter and more humid than Houston.
Here is an article on Houston and humidity.
http://usatoday30.usatoday.com/weather/resources/askjack/2003-09-03-answers-fla-texas-humidity_x.htm
Here are some charts.
http://www.currentresults.com/Weather/US/hot-humid-days-cities.php