The climate in Opatija is temperate Mediterranean characterised by mild winters and pleasant summers.
Annual average hours of sunshine is 2,157 (767 from November to April), and the amount of precipitation is increased – 1,570 mm annually.
Average air temperature in summer is 21.9 °C/71.4 °F, and in winter 7 °C/44.6 °F. A distinctive feature of Opatija is the way it experiences no extremes of heat, either by day or by night, and snow in winter is a rarity.