Taking the local weather in Kottayam into account is an important factor for planning your visit, especially if you plan to spend your trip by the pool. 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 26°C. The rainiest months in Kottayam are June, July, August and May, with each month seeing an average of 461 mm of rainfall.