If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Kataragama: The hottest months are usually April and June, with an average temperature of 28°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Kataragama are November, December, October and April, with each month seeing an average of 195 mm of rainfall.