The highest day temperature in May 2025 was 90°F. The lowest night temperature was 67°F. The average values for day and night temperatures during May were 79.8°F и 70.1°F respectivly.

The average sea surface temperature in May 2025 for Rio das Ostras was 77.1°F. The maximum and minimum values were 75.2°F and 78.6°F respectively.

Most of the days in May are sunny but you can also expect cloudy and gloomy days.

Precipitation total in May for Rio das Ostras is 0.5 in. It makes may one of the least rainy months of the year.

The average wind speed in May is 7.3 mph. It makes May one of the most windless months of the year for Rio das Ostras.

We are using day length and cloud cover information for each day of the month to calculate averages for this chart. Average sunny hours for Rio das Ostras in May is 6.8 hours.