Lošinj is the 11th largest Adriatic island by area, 33 km (21 mi) long, with the width varying from 4.75 km (2.95 mi) in the north and middle of the island, to 0.25 km (0.16 mi) near the town of Mali Lošinj. The total coastline of the island is 112.7 km (70.0 mi).
With around 2600 hours of sunshine a year, the island has become a popular destination for Slovenian, German and Italian tourists in the summer months. Average air humidity is 70%, and the average summer temperature is 24 °C (75 °F) and 7 °C (45 °F) during the winter.
The island has a mild climate and evergreen vegetation (like myrtle, holm oak, and laurel). The highest elevations in the north have more sparse vegetation. Veli Lošinj, Čikat and the south-western coast are ringed by pine forests.