Getting an idea of what to expect from the weather in Sammaattiwadiya will help you enjoy your stay to the fullest. The hottest months are usually March and April, with an average temperature of 28°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Sammaattiwadiya are November, October, May and December, with each month seeing an average of 265 mm of rainfall.