Other facts from our historical weather data: Which is the warmest month in Santo André? February has an average maximum temperature of 30°C (86°F) and is the warmest month of the year. Which is the coldest month in Santo André? The coldest month is August with an average maximum temperature of 26°C (79°F). Which is the wettest month in Santo André? November tops the wettest month list with 169mm (6.7 in) of rainfall. Which is the driest month in Santo André? September is the driest month with 66mm (2.6 in) of precipitation. 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.