Other facts from our historical weather data: Which is the wettest month in Karachi? August tops the wettest month list with 57mm (2.2 in) of rainfall. Which is the driest month in Karachi? April is the driest month with 1mm (0 in) of precipitation. Which is the sunniest month in Karachi? May is the sunniest month with an average of 299 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.