In September, Rio das Ostras typically sees daytime highs of 25.1°C and overnight lows around 18.8°C. Compared to the annual average high of 26.8°C, September runs -1.7°C.
September in Rio das Ostras averages a daytime high of 25.1°C and an overnight low of 18.8°C.
September runs -1.7°C compared to Rio das Ostras's annual average high of 26.8°C, ranking #9 of 12 months by warmth.
Plan for daytime highs near 25.1°C and cooler evenings around 18.8°C.