Planning for the weather is a good way to make your trip to Kottayam relaxing and enjoyable, especially when you’re splurging. The hottest months are usually March and February with an average temp of 82°F, while the coldest months are January and December with an average of 80°F. The rainiest months in Kottayam are June, July, August, and May, with each month seeing an average of 18 inches of rainfall.