The best time to travel to Istanbul is in April/May/June or September/October, when there are fewer tourists and mild temperatures. Be careful, it is very common to see snow fall on the city from the beginning of December, and this until the end of February, sometimes even in early March. If this persists, Istanbul may find itself completely blocked and traffic becomes an impossible mission. The busiest months are July, August, May and September respectively, followed by almost October. Christmas and New Year's Eve weeks are also very popular.