Planning for the weather is a good way to make your trip to Thanjavur relaxing and enjoyable, especially when you're splurging. The hottest months are usually May and April, with an average temperature of 31°C, while the coldest months are January and February, with an average of 25°C. The rainiest months in Thanjavur are November, October, December and September, with each month seeing an average of 177 mm of rainfall.