In September, Sao Luis typically sees daytime highs of 32.4°C and overnight lows around 23.3°C. Compared to the annual average high of 31.4°C, September runs +1.0°C.
September in Sao Luis averages a daytime high of 32.4°C and an overnight low of 23.3°C.
September runs +1.0°C compared to Sao Luis's annual average high of 31.4°C, ranking #3 of 12 months by warmth.
Plan for daytime highs near 32.4°C and cooler evenings around 23.3°C.