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 Sigiriya: The hottest months are usually April and May, with an average temperature of 27°C, while the coldest months are January and February, with an average of 24°C. The rainiest months in Sigiriya are November, December, October and January, with each month seeing an average of 243 mm of rainfall.