Planning for the weather is a good way to make your trip to Sylhet relaxing and enjoyable, especially when you’re splurging. The hottest months are usually April and May, with an average temperature of 27°C, while the coldest months are January and December, with an average of 21°C. The rainiest months in Sylhet are June, July, August and May, with each month seeing an average of 872 mm of rainfall.