Welcome to Sochi
While the sea is warm and the climate subtropical (among Russia’s warmest destinations in winter), Sochi's beaches are disappointingly rocky and grey. You might find (imported) finer white sand at some private beaches in the summer months. In any case, the peak beach-going season (May to September) sees substantially higher prices.
In recent years, Sochi has become most famous as the host city for the 2014 Winter Olympics (even though the events were actually held at the neighbouring resorts of Adler and Krasnaya Polyana).