If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Munnar: The hottest months are usually March and April, with an average temperature of 24°C, while the coldest months are January and February, with an average of 22°C. The rainiest months in Munnar are July, August, June and October, with each month seeing an average of 554 mm of rainfall.