In September, Sao Tome typically sees daytime highs of 27.9°C and overnight lows around 21.6°C. Compared to the annual average high of 28.7°C, September runs -0.7°C.
September in Sao Tome averages a daytime high of 27.9°C and an overnight low of 21.6°C.
September runs -0.7°C compared to Sao Tome's annual average high of 28.7°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 27.9°C and cooler evenings around 21.6°C.