In May, Rio das Ostras typically sees daytime highs of 25.8°C and overnight lows around 18.9°C. Compared to the annual average high of 26.8°C, May runs -1.0°C.
May in Rio das Ostras averages a daytime high of 25.8°C and an overnight low of 18.9°C.
May runs -1.0°C compared to Rio das Ostras's annual average high of 26.8°C, ranking #7 of 12 months by warmth.
Plan for daytime highs near 25.8°C and cooler evenings around 18.9°C.