Monaco — Sea Water Temperature and Annual Ranges
Up-to-date sea water temperatures for the coasts of Monaco. Learn about today’s conditions, monthly averages, and how the surrounding seas and oceans vary by season. We find every place where you can swim and show you the water temperature there today and throughout the year.
Sea Water Temperature Along the Coast
Chart of Average Temperature Changes Over the Last 60 Days
Places with the Warmest Sea Water Today
The Most Popular Seaside Places
Coastal Seas and Oceans
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Monaco’s coastline on the Mediterranean has relatively mild sea temperatures compared with northern Europe, and these change predictably with the seasons. In winter (December–February) surface water typically ranges from about 12–15 °C (54–59 °F), rising during spring (March–May) to roughly 14–19 °C (57–66 °F). Summer (June–August) brings the warmest conditions, with averages around 20–26 °C (68–79 °F) and peak values often in July and August. In autumn (September–November) temperatures generally fall back to roughly 16–21 °C (61–70 °F). Local factors such as coastal exposure, depth, and occasional upwelling can cause small variations from these averages, and short-term weather patterns may produce warmer or cooler spells.
Swimming Conditions
Swimming is widely permitted and popular along Monaco’s coastal strip, with a mix of public beaches, private beach clubs, lidos, and municipal pools available to residents and visitors. Lifeguards and regulated bathing areas are common in the summer months, and the water quality is regularly monitored, reflecting strong local environmental controls. Swimming year-round is possible but less comfortable outside late spring to early autumn unless one uses a wetsuit; winter sea temperatures are brisk and only recommended for experienced cold-water swimmers. Bathing may be restricted near harbors, boat traffic zones, or after heavy rainfall when runoff can temporarily affect water quality, so it’s advisable to heed local signs and guidance for safety.