Visiting local bars in Bumthang is better in good weather. These temperatures and rainfall averages can help you choose the best time for bar hopping. The hottest months are usually August and July with an average temp of 58°F, while the coldest months are January and February with an average of 38°F. The rainiest months in Bumthang are July, June, August, and September, with each month seeing an average of 17 inches of rainfall.