Houston is considered #10 on the most humid cities in America list, with an average humidity level of 75%. It ranks #8 in the top 10 most uncomfortable cities for combinations of summer heat and humidity. The average September temperature is 89 degrees for the high and 69 degrees for the low. Average September rainfall is 4.33 inches.
Sugarland averages 5.10 inches of rain in September. Average temperatures for September are 91 for the high and 71 for the low.
Energy use goes up significantly during the summer months in the Houston area due to high heat and humidity, which puts a great deal of pressure on electric companies to have enough energy to keep the largest city in Texas cool.