Other facts from our historical weather data: When is the rainy season in Teresina? Rainy season in Teresina occurs in the months of January, February, March and April. Does Teresina have a dry season? Yes, the months of June, July, August, September and October are very dry. Which is the hottest month in Teresina? October has an average maximum temperature of 38°C (100°F) and is the hottest month of the year. Which is the coolest month in Teresina? The coolest month is March with an average maximum temperature of 32°C (90°F). Which is the wettest month in Teresina? March tops the wettest month list with 325mm (12.8 in) of rainfall. Which is the driest month in Teresina? August is the driest month with 3mm (0.1 in) of precipitation. Which is the sunniest month in Teresina? August is the sunniest month with an average of 316 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.