In September, Piedras Negras typically sees daytime highs of 33.8°C and overnight lows around 20.5°C. Compared to the annual average high of 28.6°C, September runs +5.2°C.
September in Piedras Negras averages a daytime high of 33.8°C and an overnight low of 20.5°C.
September runs +5.2°C compared to Piedras Negras's annual average high of 28.6°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 33.8°C and cooler evenings around 20.5°C.