Planning for the weather is an important factor for making your trip to Rameshwaram a success, especially when you’re splurging. The hottest months are usually May and April, with an average temperature of 29°C, while the coldest months are January and February, with an average of 27°C. The rainiest months in Rameshwaram are November, December, October and May, with each month seeing an average of 276 mm of rainfall.