The best season for Sitamarhi travel is in winters during months of October and March as this time is really perfect for visiting this destination. Summer lasts in Sitamarhi between April and June with an average temperature between 26°C and 44°C. Monsoon Season starts in July and continues till September with regular rainfall. Winter starts in November and remains till February where average temperature remains between 16°C and 28°C making the weather really cool. This is the best time for Sitamarhi tour.