The highest day temperature in May 2025 was 94°F. The lowest night temperature was 61°F. The average values for day and night temperatures during May were 89.7°F и 73.2°F respectivly.

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

Precipitation total in May for Rio Branco is 1.2 in.

The average wind speed in May is 3.1 mph. This value is relatively stable throughout the year.

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 Branco in May is 6.2 hours.