Lake St. Moritz
Lake St. Moritz is a Swiss lake (Graubünden) at 1768 m, covering 0.78 km² with a maximum depth of 44 m. Typical winds: Malojawind, thermische Winde. Main shores and access points: St. Moritz-Bad, St. Moritz-Dorf, Celerina. The weather above is computed over the middle of the lake; the “Wind on the lake” section details hourly speed, gusts and direction — for sailing, windsurfing, paddling, fishing or swimming.
Climate of Lake St. Moritz: 1991–2020 normals
In Lake St. Moritz (1768 m), the mean annual temperature is 2.4 °C. The warmest month is July (11.8 °C on average) and the coldest January (−7.3 °C). About 747 mm of precipitation falls per year, peaking in August (100 mm) with a minimum in February (24 mm). The sun shines for about 1766 hours a year, mostly in July (199 h). On average there are 221 frost days per year. The mean monthly maximum reaches 23.2 °C and the absolute minimum −23.7 °C.
Mean monthly precipitation (mm) — bar height relative to the wettest month.
| Month | Mean T | Abs. max | Abs. min | Precip. (mm) | Sunshine (h) | Frost days | Summer days |
|---|---|---|---|---|---|---|---|
| Jan | −7.3 °C | 5.7 °C | −23.7 °C | 34 | 120 | 31 | 0 |
| Feb | −6.5 °C | 7.3 °C | −23.6 °C | 24 | 121 | 28 | 0 |
| Mar | −2.4 °C | 9.9 °C | −19.1 °C | 30 | 147 | 30 | 0 |
| Apr | 1.5 °C | 13.4 °C | −12.3 °C | 44 | 150 | 26 | 0 |
| May | 6.2 °C | 18.0 °C | −5.5 °C | 71 | 164 | 13 | 0 |
| Jun | 9.9 °C | 22.0 °C | −2.0 °C | 91 | 186 | 4 | 0 |
| Jul | 11.8 °C | 23.2 °C | −0.0 °C | 86 | 199 | 1 | 1 |
| Aug | 11.6 °C | 22.8 °C | −0.4 °C | 100 | 181 | 2 | 1 |
| Sep | 7.7 °C | 19.1 °C | −4.3 °C | 74 | 155 | 9 | 0 |
| Oct | 3.8 °C | 16.1 °C | −9.3 °C | 79 | 138 | 20 | 0 |
| Nov | −1.5 °C | 11.6 °C | −16.1 °C | 74 | 103 | 27 | 0 |
| Dec | −5.8 °C | 6.3 °C | −21.3 °C | 41 | 102 | 31 | 0 |
| Year | 2.4 °C | 23.2 °C | −23.7 °C | 747 | 1766 | 221 | 3 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Samedan (5 km, 1709 m), Piz Corvatsch (8 km, 3294 m), Segl-Maria (9 km, 1804 m), adjusted to the elevation of Lake St. Moritz (1768 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Lake Silvaplana (6 km · 1791 m)
- Weather Lake Sils (12 km · 1797 m)
- Weather Lake Poschiavo (29 km · 962 m)
- Weather Lake Davos (37 km · 1560 m)
- Weather Lake Cauma (56 km · 997 m)
- Weather Lake Walen (86 km · 419 m)
Nearby municipalities
- Weather St. Moritz (1 km)
- Weather Celerina/Schlarigna (1 km)
- Weather Silvaplana (4 km)
- Weather Samedan (5 km)
- Weather Sils im Engadin/Segl (8 km)
- Weather Pontresina (9 km)
- Weather La Punt Chamues-ch (10 km)
- Weather Bever (10 km)
Swiss lakes Weather St. Moritz
Frequently asked questions about the weather: Lake St. Moritz
What is the wind like on Lake St. Moritz today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (1768 m).
Can you swim in Lake St. Moritz?
At 1768 m the water stays cold all year (often below 15 °C in summer): swimming is for the brave, mostly in July–August. Check the air temperature, sunshine and UV index above to pick your slot.
What are the typical winds on Lake St. Moritz?
Characteristic winds: Malojawind, thermische Winde. Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake St. Moritz?
The warmest month in Lake St. Moritz is July, averaging 11.8 °C (1991–2020 normal). The coldest is January at −7.3 °C.
How much does it rain in Lake St. Moritz per year?
Lake St. Moritz receives about 747 mm of precipitation a year. The wettest month is August (100 mm), the driest February (24 mm).
When is the best time to visit Lake St. Moritz?
For warmth and sunshine: July (11.8 °C on average, 199 h of sun). The coldest month is January (−7.3 °C). Check the 15-day forecast above for your dates.