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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.
1 So Paulo, Brazil is at 2330'S, 4637'W, 792 m (2598 ft). See map.  So Paulo has a humid subtropical climate that is mild with no dry season, constantly moist (year-round rainfall). Summers are hot and muggy with thunderstorms. Winters are mild with precipitation from mid-latitude cyclones.