Lago di Lei Monastery
High-altitude reservoir straddling Swiss-Italian border
An alpine reservoir in Grisons created by a high mountain dam, Lago di Lei draws hikers and anglers to remote trails, scree slopes and quiet mountain water.
Lago di Lei at a Glance#
About Lago di Lei#
Lago di Lei is a high-altitude reservoir in the Alps on the border between Switzerland and Italy, administratively associated with the canton of Graubünden (Grisons) on the Swiss side. The lake was created for hydropower and water storage.
The reservoir occupies a mountain valley and is ringed by alpine peaks and steep valley sides typical of the region. Access and infrastructure are oriented around the dam and associated service roads.
The lake was formed when a dam was built to create a hydropower reservoir; the installation is operated as part of regional power systems and water management.
Geographically it lies in the Grisons region of eastern Switzerland near the international border with Italy, at high elevation in the Alpine massif.
- Cross-border reservoir: Sits on the Switzerland-Italy border and is a high-altitude hydroelectric reservoir used for power generation and water storage.
Best Time to Visit Lago di Lei#
The best time to visit Lago di Lei is summer, when alpine roads are most likely open and the mountain scenery is accessible.
Weather & Climate near Lago di Lei#
Lago di Lei's climate is classified as Subarctic - Subarctic climate with cool summers (peaking in July) and freezing winters (coldest in January). Temperatures range from -10°C to 15°C. Abundant rainfall (1407 mm/year), wettest in June.
| Month | Comfort | Temp | Feels | Rain | Sky | Humidity | Wind | UV | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | Poor | -10° - -1° | -10° | 81 mm | partly cloudy | 90% | 2.9 m/s | 0.2 low | 8.9h |
| February | Poor | -10° - -1° | -11° | 59 mm | partly cloudy | 92% | 3.1 m/s | 0.3 low | 10.2h |
| March | Poor | -8° - 1° | -8° | 85 mm | partly cloudy | 93% | 3.3 m/s | 0.7 moderate | 11.8h |
| April | Poor | -4° - 3° | -5° | 120 mm | overcast | 87% | 3.3 m/s | 1.0 high | 13.4h |
| May | Poor | 0° - 8° | 1° | 142 mm | overcast | 81% | 3.0 m/s | 1.3 high | 14.8h |
| June | Poor | 3° - 12° | 6° | 152 mm | overcast | 79% | 2.8 m/s | 1.7 very high | 15.6h |
| July | Acceptable | 5° - 15° | 10° | 146 mm | partly cloudy | 79% | 2.8 m/s | 1.7 very high | 15.2h |
| August | Acceptable | 5° - 15° | 10° | 149 mm | partly cloudy | 81% | 2.6 m/s | 1.4 high | 14.0h |
| September | Acceptable | 2° - 12° | 5° | 147 mm | partly cloudy | 83% | 2.8 m/s | 1.0 moderate | 12.4h |
| October | Poor | -1° - 7° | 0° | 137 mm | partly cloudy | 86% | 2.9 m/s | 0.5 low | 10.7h |
| November | Poor | -6° - 2° | -6° | 108 mm | partly cloudy | 90% | 3.0 m/s | 0.2 low | 9.3h |
| December | Poor | -9° - -1° | -9° | 81 mm | partly cloudy | 89% | 3.0 m/s | 0.1 low | 8.5h |
