Reservoir · Switzerland
Lake St. Moritz
St. Moritzersee
Reservoir in Graubünden, Switzerland
- Area
- 0.6km²
- Max depth
- 44m
- Average depth
- 7.8m
- Elevation
- 1,766m a.s.l.
- Shoreline
- 3.8km
- Volume
- 0.005km³
Lake St. Moritz is a reservoir in Switzerland. It covers 0.6 km². On average it is 7.8 m deep, and 44 m at its deepest point. Its surface lies 1,766 m above sea level.
Plan your visit
Stay, sail and get there
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The water
How warm is Lake St. Moritz?
The water is warmest in August, around 17 °C at the surface, and coldest in January, around 0 °C. Even at its warmest, the surface stays below 17 °C on average: this is cold water.
The lake usually freezes over for about 128 days a year, from around 26 November to 2 April.
On the shore, afternoons reach 16 °C on average in July and -6 °C in January. The driest month is February (47 mm of rain), the wettest August (144 mm).
Average surface temperature measured by the Landsat 8 satellite between 2013 and 2021 at the point furthest from the shore (131 readings). Shallow bays and beaches are often warmer.
From above
The whole lake from space
Month by month
The year at the lake, month by month
Not a forecast: these are averages over many years. Water is the 2013–2021 average; air, rain, sun and wind are the 1991–2020 average.
Water: 2013–2021 averageClimate: 1991–2020 average
| Month | Water°C | Water high°C | Air high°C | Air low°C | Rainmm | Rainy daysdays | Sunh/day | Windkm/h |
|---|---|---|---|---|---|---|---|---|
| January | Ice | — | -6 | -15 | 55 | 11 | 4.4 | 7 |
| February | Ice | — | -5 | -15 | 47 | 10 | 5.6 | 8 |
| March | Ice | — | -2 | -10 | 61 | 12 | 6.6 | 7 |
| April | 3 | 6 | 4 | -5 | 81 | 15 | 6.1 | 7 |
| May | 8 | 11 | 9 | 0 | 120 | 19 | 6.1 | 8 |
| June | 13 | 15 | 14 | 4 | 129 | 19 | 7.5 | 7 |
| July | 16 | 17 | 16 | 6 | 129 | 20 | 8.1 | 7 |
| August | 17 | 17 | 15 | 6 | 144 | 19 | 7.3 | 6 |
| September | 15 | 16 | 11 | 2 | 99 | 15 | 6.3 | 6 |
| October | 10 | 13 | 7 | -2 | 99 | 14 | 5.1 | 6 |
| November | 3 | 6 | 0 | -7 | 102 | 13 | 3.6 | 7 |
| December | Ice | — | -4 | -13 | 65 | 12 | 3.7 | 7 |
Water: LakeTEMP (Landsat 8, 2013–2021). Air, rain, sun and wind: NASA POWER, 1991–2020 averages. A rainy day has at least 1 mm of rain. Sunshine hours are derived from measured solar radiation.
Size & depth
How big, how deep
- On average, water stays in the lake for about 9 days before flowing out.
- Its catchment drains 162 km² of land.
- About 5.8 m³ of water flow out every second, on average.
Around the shore
What's around Lake St. Moritz
Counted within 1.5 km of the shoreline in OpenStreetMap, the map anyone can edit.
- 1beaches and swimming spots
- —campsites
- 1boat hire and water-sport clubs
Segelclub St. Moritz
- —marinas and slipways
- —ferry piers
- 3viewpoints
Fullun
- 44hotels, B&Bs and chalets
Kulm Hotel, Badrutt's Palace, Monopol, Hotel Bären, Hotel Schweizerhof and 39 more
- —fishing spots
- 52restaurants and cafés
Towns on the shore
- St. Moritz4,952 people
- Celerina1,241 people
Nearest airport with scheduled flights: Lugano Airport (LUG), 90 km in a straight line.
Car hire at BGY airport (Orio al Serio)Discover Cars · Affiliate linkOpenStreetMap is built by volunteers: when a number is low, it may just mean nobody has mapped it yet.
Recent years
How each month compared
Afternoon high on the shore. The first row is the reference, the 1991–2020 average in °C; the years below show the difference from it: warmer in orange, cooler in blue.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1991–2020 average | -5.6 | -4.8 | -1.5 | 3.6 | 9.2 | 14.0 | 15.9 | 15.3 | 11.4 | 6.7 | 0.2 | -4.5 |
| 2020 | +2.1 | +2.0 | ±0.0 | +2.4 | +1.4 | −1.4 | +0.8 | +0.8 | +1.0 | −2.5 | +3.9 | −0.2 |
| 2021 | −1.7 | +2.6 | −1.0 | −3.2 | −2.5 | +0.9 | −0.5 | −0.9 | +1.8 | −0.8 | −0.5 | +0.9 |
| 2022 | +0.8 | +1.1 | +1.3 | +1.3 | +2.4 | +2.3 | +2.2 | +1.9 | −1.1 | +3.2 | +0.5 | +1.3 |
| 2023 | +0.2 | +1.8 | +2.8 | −0.4 | −0.1 | +1.1 | +0.7 | +1.0 | +3.8 | +3.0 | −2.1 | +2.3 |
| 2024 | +1.9 | +3.6 | +1.2 | −1.8 | −0.9 | −0.6 | +1.5 | +2.7 | −1.6 | +1.1 | +2.3 | +2.0 |
| 2025 | +1.9 | +2.5 | +1.6 | +2.9 | +0.2 | +3.9 | −1.2 | +1.0 | +0.6 | −0.3 | −0.2 | +2.6 |
+1 warmer than usual −1 cooler than usual
Nearby
More lakes nearby
ItalyAbout these numbers
| Outline, area, depth, volume | HydroLAKES v1.0 (Messager et al. 2016) · CC BY 4.0 |
|---|---|
| Water temperature and ice | LakeTEMP v1 (Korver et al. 2024), Landsat 8 2013–2021 · CC BY 4.0 |
| Air, rain, sun, wind | NASA POWER, 1991–2020 · public domain |
| Names and description | Wikidata (Q664496) · CC0 |
| Around the shore | © OpenStreetMap contributors · ODbL |
| Images | EOX Sentinel-2 cloudless 2016 · CC BY 4.0; Wikimedia Commons |
Every figure is an average or a count from a public dataset. Licences and methods: data sources.
