Visiting local bars in Birgunj 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 April and May with an average temp of 86°F, while the coldest months are January and December with an average of 67°F. The rainiest months in Birgunj are July, August, September, and June, with each month seeing an average of 16 inches of rainfall.