Planning for the weather is an important factor for making your trip to Anniwatta a success, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 24°C, while the coldest months are January and February, with an average of 23°C. The rainiest months in Anniwatta are November, October, December and April, with each month seeing an average of 355 mm of rainfall.