Rijeka (Italian: Fiume) is a city in Kvarner. It is the principal seaport of Croatia, located on Kvarner Bay, an inlet of the Adriatic Sea. It has 128,735 inhabitants (2011) with greater city area reaching up to 200,000 and is Croatia's third largest city.
Rijeka climate is Humid subtropical, with warm summers and relatively mild and rainy winters. Warmest month is August with average temperature between 18.6° and 28.1°C. Coldest month is January with temperatures between 2.9° and 9.1°C. The climate is also characterized by frequent rainfall. Month with highest rainfall is October. The best month for swimming is August, with average sea temperature of 24.9°C.