Russia — Sea Water Temperature and Annual Ranges

Sea Water Temperature Along the Coast

Places with the Warmest Sea Water Today

The Most Popular Seaside Places

Coastal Seas and Oceans

Water Temperature and Swimming Overview

Water Temperature Trends

Russia’s coastline spans very different seas, so water temperatures and swimming conditions vary widely. On the warmest shores, such as parts of the Black Sea and the southern Caspian, summer surface temperatures commonly reach about 18–25 °C (64–77 °F) and in sheltered southern spots can rise to 25–30 °C (77–86 °F), making casual swimming comfortable from late spring through early autumn. The Baltic coast, including Kaliningrad and the Gulf of Finland, is cooler: summer water typically ranges from roughly 10–20 °C (50–68 °F), with warmest conditions in July and August and much colder water in shoulder seasons. Far eastern coasts along the Sea of Japan and parts of the Pacific can see summer temperatures roughly between 10 and 22 °C (50–72 °F), while the colder Sea of Okhotsk and Bering regions are often only a few degrees above freezing even in summer.

Swimming Conditions

In Arctic and subarctic waters — the Barents, Kara and other northern seas — surface temperatures stay very low, often around −1 to 6 °C (30–43 °F), and sea ice persists seasonally, so conventional swimming is impractical and hazardous. Across Russia, swimming is permitted and popular where conditions allow, especially at managed beaches in summer months (roughly June–August, extended to May–September in southern areas). However, safety considerations are important: cold shock, strong currents, limited lifeguard coverage in remote areas and local pollution can restrict safe swimming even when temperatures seem moderate. Visitors should check local advisories and choose supervised beaches if planning to swim.