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 temp of 73°F, while the coldest months are January and December with an average of 57°F. The rainiest months in Namchi are July, August, June, and September, with each month seeing an average of 34 inches of rainfall.