Zagreb has a continental climate, with four distinct seasons. Winters are cold, and summers are normally hot and dry. The average temperature in summer is 20C, at the end of May it gets hotter and temperatures go as high as 30C. Winter temperatures average at 1C and you can expect snow during winter (December to March). Rain and fog most commonly occur during autumn (October to December).
The best time to visit Zagreb is between April and October. July and August are the busiest months. There are a multitude of cultural activities that occur in the summer months including the Dubrovnik Summer Festival.