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 temp of 88°F, while the coldest months are January and February with an average of 77°F. The rainiest months in Thanjavur are November, October, December, and September, with each month seeing an average of 7 inches of rainfall.