Luxembourg — Water Temperature in Lakes and Rivers
Find current water temperatures in lakes and rivers across Luxembourg. See today’s measurements and typical seasonal changes for inland swimming and recreation. We find every place where you can swim and show you the water temperature there today and throughout the year.
Water Temperature in Lakes and Rivers
Popular Lakes
Popular Rivers
Popular Places
Water Temperature and Swimming Overview
Regions and Map
Water Temperature Trends
Luxembourg is a small, landlocked country whose water bodies are mainly rivers and a handful of reservoirs and lakes. Seasonal surface temperatures vary noticeably: in winter rivers and shallow lakes commonly sit near freezing up to about 4–7 °C (39–45 °F), while spring brings a gradual rise into the 8–15 °C range (46–59 °F). In summer, when most people swim, surface temperatures typically reach 18–24 °C (64–75 °F) and in sheltered shallows or during heat waves can climb to around 25 °C (77 °F) or slightly higher. Autumn sees a steady cooling back toward 10–15 °C (50–59 °F) before winter chills set in again. These values are general; actual temperatures depend on water depth, flow, recent weather and altitude, so a fast-flowing stretch of river will be colder than a sun-warmed reservoir.
Swimming Conditions
Swimming is permitted in several designated bathing sites and reservoirs, most notably the Upper Sûre (Haute-Sûre) reservoir and a few managed lakes where facilities and water quality monitoring are provided. Many villagers and visitors also swim informally in calmer river sections, but such spots are not always supervised and can present hazards: strong currents, boat traffic (especially on the Moselle border waters), variable water quality and sudden temperature differences that increase cold-shock risk. Authorities typically recommend using marked beaches during the bathing season (roughly June to September), following local signage about water quality or blue-green algae, and exercising caution where lifeguards and safety infrastructure are absent.