In September, Brownsville typically sees daytime highs of 31.7°C and overnight lows around 23.5°C. Compared to the annual average high of 27.5°C, September runs +4.2°C.
September in Brownsville averages a daytime high of 31.7°C and an overnight low of 23.5°C.
September runs +4.2°C compared to Brownsville's annual average high of 27.5°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 31.7°C and cooler evenings around 23.5°C.