Planning for the weather is a good way to make your trip to Namchi relaxing and enjoyable, especially when you're splurging. The hottest months are usually June and August, with an average temperature of 23°C, while the coldest months are January and December, with an average of 14°C. The rainiest months in Namchi are July, August, June and September, with each month seeing an average of 856 mm of rainfall.