Planning for the weather is an important factor for making your trip to Siak Sri Indrapura a success, especially when you're splurging. The hottest months are usually May and March, with an average temperature of 27°C, while the coldest months are January and February, with an average of 26°C. The rainiest months in Siak Sri Indrapura are November, December, October and April, with each month seeing an average of 308 mm of rainfall.