Planning for the weather is a good way to make your trip to Thrissur relaxing and enjoyable, especially when you’re splurging. The hottest months are usually March and February, with an average temperature of 28°C, while the coldest months are January and December, with an average of 27°C. The rainiest months in Thrissur are June, July, August and May, with each month seeing an average of 525 mm of rainfall.