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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 monthly weather in Sao Paulo, Brazil. What's the best time to travel to Sao Paulo in Brazil? Here are some annual weather facts we collected from our historical weather data: Most rainfall (rainy season) is seen in January, February, March, October, November and December.