Planning for the weather is an important factor for making your trip to Phumĭ Thmei a success, especially when you're splurging. The hottest months are usually March and April, with an average temperature of 30°C, while the coldest months are December and January, with an average of 27°C. The rainiest months in Phumĭ Thmei are October, September, August and July, with each month seeing an average of 205 mm of rainfall.