Other facts from our historical weather data: Which months have the greatest rainfall in Culiacán? Most rainfall (rainy season) is seen in July, August and September. Does Culiacán have a dry season? Yes, the months of January, February, March, April, May and December are very dry. Which is the hottest month in Culiacán? June has an average maximum temperature of 37°C (99°F) and is the hottest month of the year. Which is the coolest month in Culiacán? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Culiacán? August tops the wettest month list with 194mm (7.6 in) of rainfall. Which is the driest month in Culiacán? May is the driest month with 2mm (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.