In September, Las Piedras typically sees daytime highs of 18.8°C and overnight lows around 7.8°C. Compared to the annual average high of 22.1°C, September runs -3.4°C.
September in Las Piedras averages a daytime high of 18.8°C and an overnight low of 7.8°C.
September runs -3.4°C compared to Las Piedras's annual average high of 22.1°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 18.8°C and cooler evenings around 7.8°C.