Other facts from our historical weather data: Which months have the greatest rainfall in São José? Most rainfall (rainy season) is seen in May and June. Which is the warmest month in São José? March has an average maximum temperature of 29°C (84°F) and is the warmest month of the year. Which is the coldest month in São José? The coldest month is August with an average maximum temperature of 27°C (81°F). Which is the wettest month in São José? May tops the wettest month list with 183mm (7.2 in) of rainfall. Which is the driest month in São José? December is the driest month with 41mm (1.6 in) of precipitation. Which is the sunniest month in São José? January is the sunniest month with an average of 266 hours of sunshine. No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.