September in Nuevo Laredo is the rainiest and the cloudiest month of the year. In September, the weather in Nuevo Laredo is typically hot. Average daily high temperature in September is about 31 degrees above zero. On average, Nuevo Laredo has 13 sunny, 12 rainy, and 5 partly cloudy days in September. The rains are usually heavy. September as well as {{month_nom: February}}, and {{month_nom: February}} is considered the most uncomfortable time to visit Nuevo Laredo.