Conditions in late September

You will definitely feel the heat and humidity more during that time of the year. How rainy it is or isn't changes from year to year. It can be amazing to see the late afternoon thunderstorms roll in and drench the place for the evening. It is one of my favorite times of year because the foliage is fully green and hills are alive with flowers and fauna. Definitely expect more insects and mosquitos, but they are manageable.