Question: when does the weather start to cool down in houston?
Answer: The minimum temperature usually falls between 68 and 72 °F (20 to 22 °C). The days at Houston begin to cool down quickly during September. By the end of the month, the temperature has dropped around 7 °F (4 °C) below what it was at the start. Nearly every September day warms to over 80 °F (27 °C) in Houston.