Other facts from our historical weather data: When is the rainy season in Imperatriz? Rainy season in Imperatriz occurs in the months of January, February, March, April and December. Does Imperatriz have a dry season? Yes, the months of June, July, August and September are very dry. Which is the hottest month in Imperatriz? September has an average maximum temperature of 36°C (97°F) and is the hottest month of the year. Which is the coolest month in Imperatriz? The coolest month is July with an average maximum temperature of 32°C (90°F). Which is the wettest month in Imperatriz? February tops the wettest month list with 240mm (9.4 in) of rainfall. Which is the driest month in Imperatriz? August is the driest month with 3mm (0.1 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.