Opatija weather is typically Croatian and ideal to visit all round the year. Depending on the activities that you are looking for on your trip to Opatija, the best times vary.
Summer: On average, the warmest months are July and August and best months for swimming are June, July, August and September.
Winter: February is the coldest month of the year and is basically off season in Opatija. The rainiest months are September and December.
Peak Season: The months between May to September is the peak season to visit Opatija and the island is flooded with tourists. This is a great time for partying and hitting the beaches.
Good Season: July and August are the most popular months among the visitors. However, if you want to avoid the crowds and yet enjoy the beach season, the best time to visit Opatija is in the months of May, June, September and early October.