Algeria — 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

Algeria’s coastline on the Mediterranean Sea experiences noticeable seasonal shifts in sea temperature. In winter the water is coolest, usually around 13–16 °C (55–61 °F), which many swimmers find chilly. Spring brings a gradual rise, with sea temperatures typically moving into the mid-teens to around 20 °C (57–68 °F) by late spring. Summer is the warmest period: July and August often see coastal waters between about 22 and 28 °C (72–82 °F), making swimming comfortable for most people. Autumn produces a gradual cooling again, with temperatures commonly falling from roughly 24 °C (75 °F) in early autumn to the high teens (around 18–20 °C, or 64–68 °F) as winter approaches. Local variations occur, so water near river mouths, shallow bays, or in sheltered harbors can warm or cool faster than open-coast areas.

Swimming Conditions

Swimming along Algeria’s beaches is generally permitted and is a popular seasonal activity, especially during the summer months when sea temperatures are warm and beach infrastructure is busiest. Authorities may operate lifeguards on main beaches and post warnings or close access temporarily during storms, strong currents, or pollution incidents, so safety notices should be followed. Outside summer, swimming becomes less comfortable for prolonged exposure and conditions can be rougher; some swimmers still enter the water year-round, but caution is advised. Additionally, occasional jellyfish blooms or water-quality issues near urban outlets can affect local conditions, so checking current local advisories is sensible before planning to swim.