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Sao Paulo: Annual Weather Averages. January is the hottest month in Sao Paulo with an average temperature of 25Â°C (76Â°F) and the coldest is June at 19Â°C (66Â°F) with the most daily sunshine hours at 6 in August. The wettest month is January with an average of 170mm of rain.
Average Temperatures in Rio De Janeiro, Brazil. 1  The mean temperature in Rio De Janeiro, Brazil is fairly hot at 23.7 degrees Celsius (74.7 degrees Fahrenheit). 2  There is a range of mean monthly temperatures of 5.2 C (9.4 F) which is a very low range.