Other facts from our historical weather data: Which months have the greatest rainfall in Dambulla? Most rainfall (rainy season) is seen in October, November and December. Which is the hottest month in Dambulla? April has an average maximum temperature of 34°C (93°F) and is the hottest month of the year. Which is the coolest month in Dambulla? The coolest month is January with an average maximum temperature of 29°C (84°F). Which is the wettest month in Dambulla? November tops the wettest month list with 255mm (10 in) of rainfall. Which is the driest month in Dambulla? June is the driest month with 46mm (1.8 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.