In September, Willemstad typically sees daytime highs of 31.9°C and overnight lows around 26.3°C. Compared to the annual average high of 30.6°C, September runs +1.3°C.
September in Willemstad averages a daytime high of 31.9°C and an overnight low of 26.3°C.
September runs +1.3°C compared to Willemstad's annual average high of 30.6°C, ranking #1 of 12 months by warmth.
Plan for daytime highs near 31.9°C and cooler evenings around 26.3°C.