Other facts from our historical weather data: Which is the hottest month in Ati? April has an average maximum temperature of 43°C (109°F) and is the hottest month of the year. Which is the coolest month in Ati? The coolest month is January with an average maximum temperature of 33°C (91°F). Which is the wettest month in Ati? August tops the wettest month list with 184mm (7.2 in) of rainfall. Which is the driest month in Ati? December is the driest month with 0mm (0 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.