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Johnny Chicago CC BY-SA 4.0 Wikimedia Commons

Upper Sûre Lake

Reservoir

Upper Sûre Lake in northwestern Luxembourg serves as a reservoir and recreation area; visitors hike, cycle and launch small boats inside the Upper Sûre Nature Park.

Upper Sûre Lake Luxembourg CityViandenUpper Sûre Lake
In this guide

Upper Sûre Lake essentials

Admission: Free (lake and park access)

About Upper Sûre Lake

Upper Sûre Lake is an artificial reservoir on the Sûre (Sauer) River in northwestern Luxembourg, created by damming the river and forming a long, narrow lake. It functions both as a regional water supply source and as a recreational area within a protected landscape.

The reservoir shoreline supports walking and cycling routes, watersports and small settlements that cater to visitors, and the surrounding countryside is managed for nature conservation and recreation. The lake lies within the Upper Sûre Nature Park, which combines environmental protection with visitor facilities.

The reservoir is located in the Wiltz area of northern Luxembourg and sits amid rolling wooded hills and agricultural land, reachable from nearby towns by regional roads.

  • Nature park designation: The reservoir lies inside the Upper Sûre Nature Park, which combines water supply infrastructure with protected countryside and recreational facilities.

What to See#

  • Dam and shoreline recreational areas: The dam and reservoir shoreline provide recreational access points used for walking, boating and water sports, with several small villages on the reservoir’s edge.
Things to Do
When to Go

Best Time to Visit Upper Sûre Lake

The reservoir and the surrounding Parc naturel de la Haute-Sûre are best experienced from late spring through early autumn; crowds are light outside July and August.

Summer
June-August · 15-25°C (59-77°F)
Warm days for swimming and boating; water recreation is popular and the park feels alive.
Autumn
September-October · 8-15°C (46-59°F)
Leaves turn fast in the Upper Sûre Nature Park; clearer air and quieter trails.

Weather & Climate near Upper Sûre Lake

Climate

Upper Sûre Lake's climate is classified as Oceanic - Oceanic climate with mild summers (peaking in August) and cold winters (coldest in January). Temperatures range from -2°C to 21°C. Moderate rainfall (926 mm/year).

Air Quality: AQI 30 Good
Best Time to Visit
JulyAugustSeptember
Temperature & Rainfall
Temperature Range
39°
Warmest Month
-20°
Coldest Month
Monthly Conditions
Month Comfort Temp Feels Rain Sky Humidity Wind UV Daylight
January Poor -2° - 3° -4° 96 mm overcast 95% 4.2 m/s 0.1 low 8.5h
February Poor -2° - 4° -3° 72 mm overcast 93% 3.9 m/s 0.2 low 9.9h
March Poor 1° - 8° 1° 78 mm overcast 88% 4.0 m/s 0.4 low 11.7h
April Acceptable 3° - 11° 5° 62 mm partly cloudy 82% 3.7 m/s 0.8 moderate 13.6h
May Good 7° - 16° 12° 72 mm overcast 81% 3.4 m/s 1.2 high 15.2h
June Good 10° - 19° 15° 73 mm overcast 79% 3.2 m/s 1.4 high 16.0h
July Very Good 12° - 21° 17° 67 mm partly cloudy 74% 3.2 m/s 1.4 high 15.6h
August Good 12° - 21° 17° 59 mm overcast 75% 3.0 m/s 1.1 high 14.2h
September Good 9° - 17° 13° 70 mm partly cloudy 78% 3.3 m/s 0.8 moderate 12.4h
October Acceptable 6° - 12° 7° 82 mm overcast 88% 3.6 m/s 0.3 low 10.6h
November Poor 2° - 7° 1° 90 mm overcast 94% 3.8 m/s 0.1 low 8.9h
December Poor 0° - 4° -2° 105 mm overcast 96% 4.1 m/s 0.1 low 8.0h
Getting There & Around

How to Get to Upper Sûre Lake

From Wiltz, follow the N27 south-west toward Esch-sur-Sûre (about 18 km, 20-25 minutes by car). Regional buses connect Wiltz with Esch-sur-Sûre in summer; once in Esch-sur-Sûre the main lakeside trails and viewpoints are a short walk or cycle away.

Tips for Visiting Upper Sûre Lake

  • Rent a bicycle in Esch-sur-Sûre or Wiltz and follow the lakeside paths for the quietest views.
  • Head to the Belvédère de la Haute-Sûre viewpoint at sunset for the best light on the reservoir and dam - local photographers prize that vantage.
  • Bring insect repellent in summer: shallow bays and reed beds attract midges that love still water.