Temperature for September
In Brownsville, TX during September the average high temperature is 90.5°F. The hottest day on record was September 6, 2000 when the temperature hit 105.1°F.
Precipitation for September
In September the average monthly rainfall in Brownsville, TX is 3.54 inches with rain usually falling on between 9 and 10 days. 1948 was the driest September with only 0.00 inches of rain falling, and 1984 was the wettest September with 19.15 inches of rain. The wettest single day in September was 20 September 2003 when 4.90 inches of rain fell.
Tornados are reported on 0 and 1 days in September. There are thunderstorms on between 3 and 4 days in September.