In December, Rio das Ostras typically sees daytime highs of 28.1°C and overnight lows around 21.6°C. Compared to the annual average high of 26.8°C, December runs +1.3°C.
December in Rio das Ostras averages a daytime high of 28.1°C and an overnight low of 21.6°C.
December runs +1.3°C compared to Rio das Ostras's annual average high of 26.8°C, ranking #4 of 12 months by warmth.
Plan for daytime highs near 28.1°C and cooler evenings around 21.6°C.