Other facts from our historical weather data: Which is the hottest month in Ciudad Obregón? June has an average maximum temperature of 40°C (104°F) and is the hottest month of the year. Which is the coolest month in Ciudad Obregón? The coolest month is January with an average maximum temperature of 28°C (82°F). Which is the wettest month in Ciudad Obregón? August tops the wettest month list with 92mm (3.6 in) of rainfall. Which is the driest month in Ciudad Obregón? May is the driest month with 1mm (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.