Lake Sils
Lake Sils is a Swiss lake (Graubünden) at 1797 m, covering 4.1 km² with a maximum depth of 71 m. Typical winds: Malojawind (SW, nachmittags, thermisch). Main shores and access points: Sils Maria, Sils Baselgia, Maloja, Isola, Plaun da Lej. 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 Sils: 1991–2020 normals
In Lake Sils (1797 m), the mean annual temperature is 2.7 °C. The warmest month is July (11.8 °C on average) and the coldest January (−6.3 °C). About 940 mm of precipitation falls per year, peaking in August (119 mm) with a minimum in February (33 mm). The sun shines for about 1766 hours a year, mostly in July (199 h). On average there are 204 frost days per year. The mean monthly maximum reaches 22.3 °C and the absolute minimum −21.0 °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 | −6.3 °C | 5.6 °C | −20.4 °C | 46 | 120 | 31 | 0 |
| Feb | −5.9 °C | 7.5 °C | −21.0 °C | 33 | 121 | 28 | 0 |
| Mar | −2.3 °C | 9.9 °C | −17.0 °C | 44 | 147 | 30 | 0 |
| Apr | 1.2 °C | 12.5 °C | −11.5 °C | 60 | 150 | 25 | 0 |
| May | 5.9 °C | 17.2 °C | −4.3 °C | 86 | 164 | 10 | 0 |
| Jun | 9.8 °C | 21.3 °C | −0.5 °C | 107 | 186 | 2 | 0 |
| Jul | 11.8 °C | 22.3 °C | 1.4 °C | 102 | 199 | 0 | 0 |
| Aug | 11.7 °C | 22.0 °C | 1.3 °C | 119 | 181 | 0 | 0 |
| Sep | 7.9 °C | 18.5 °C | −2.2 °C | 91 | 155 | 4 | 0 |
| Oct | 4.0 °C | 15.4 °C | −7.0 °C | 100 | 138 | 17 | 0 |
| Nov | −0.9 °C | 11.1 °C | −12.8 °C | 98 | 103 | 26 | 0 |
| Dec | −4.5 °C | 6.2 °C | −17.2 °C | 54 | 102 | 31 | 0 |
| Year | 2.7 °C | 22.3 °C | −21.0 °C | 940 | 1766 | 204 | 1 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Segl-Maria (3 km, 1804 m), Piz Corvatsch (7 km, 3294 m), Samedan (16 km, 1709 m), adjusted to the elevation of Lake Sils (1797 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Lake Silvaplana (6 km · 1791 m)
- Weather Lake St. Moritz (12 km · 1768 m)
- Weather Lake Poschiavo (31 km · 962 m)
- Weather Lake Davos (45 km · 1560 m)
- Weather Lake Cauma (56 km · 997 m)
- Weather Lake Lugano (76 km · 271 m)
Nearby municipalities
- Weather Sils im Engadin/Segl (4 km)
- Weather Silvaplana (9 km)
- Weather St. Moritz (11 km)
- Weather Bever (12 km)
- Weather Celerina/Schlarigna (13 km)
- Weather Samedan (16 km)
- Weather Pontresina (16 km)
- Weather Avers (16 km)
Swiss lakes Weather Sils im Engadin/Segl
Frequently asked questions about the weather: Lake Sils
What is the wind like on Lake Sils today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (1797 m).
Can you swim in Lake Sils?
At 1797 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 Sils?
Characteristic winds: Malojawind (SW, nachmittags, thermisch). Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake Sils?
The warmest month in Lake Sils is July, averaging 11.8 °C (1991–2020 normal). The coldest is January at −6.3 °C.
How much does it rain in Lake Sils per year?
Lake Sils receives about 940 mm of precipitation a year. The wettest month is August (119 mm), the driest February (33 mm).
When is the best time to visit Lake Sils?
For warmth and sunshine: July (11.8 °C on average, 199 h of sun). The coldest month is January (−6.3 °C). Check the 15-day forecast above for your dates.