Weather will likely play an important role when you plan your trip to Namchi, but bear in mind that cheaper options are usually available when the weather isn't as good. 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.