I will suggest Oct to February is the best time to visit Munnar. As I recently visited that place. so lots of road work going on and roads are not good as of now.
I visited Munnar in the last week of December and found the weather very pleasant and clear so i guess from November to February is the best time for paying a visit.
Hi Arjun, Munnar can be visited year round. I have attached with this comment few packages, you can click on them to find more details about them and these can be customized according to you as well. If you want to talk to someone about the packages simply fill in your details in the form and you will receive a call.
In the month of June to September. This is the monsoon season in Munnar and even though many tourists avoid Munnar during the monsoons, this is a great time to visit.