Weather is probably a major factor when you plan your trip to Kotagiri, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually April and March, with an average temperature of 22°C, while the coldest months are January and February, with an average of 19°C. The rainiest months in Kotagiri are October, July, August and May, with each month seeing an average of 255 mm of rainfall.