Lake Sarnen
Lake Sarnen is a Swiss lake (Obwalden) at 469 m, covering 7.4 km² with a maximum depth of 52 m. Typical winds: Föhn, Westwind. Main shores and access points: Sarnen, Sachseln, Giswil, Wilen. 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 Sarnen: 1991–2020 normals
In Lake Sarnen (469 m), the mean annual temperature is 10.4 °C. The warmest month is July (18.6 °C on average) and the coldest January (2.7 °C). About 1266 mm of precipitation falls per year, peaking in August (138 mm) with a minimum in October (79 mm). On average there are 101 frost days and 6 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 30.4 °C and the absolute minimum −8.7 °C.
Mean monthly precipitation (mm) — bar height relative to the wettest month.
| Month | Mean T | Abs. max | Abs. min | Precip. (mm) | Frost days | Summer days |
|---|---|---|---|---|---|---|
| Jan | 2.7 °C | 14.1 °C | −8.7 °C | 95 | 25 | 0 |
| Feb | 3.0 °C | 14.8 °C | −8.3 °C | 90 | 22 | 0 |
| Mar | 6.1 °C | 18.3 °C | −5.3 °C | 94 | 14 | 0 |
| Apr | 9.4 °C | 21.7 °C | −1.5 °C | 102 | 4 | 0 |
| May | 13.4 °C | 25.9 °C | 3.1 °C | 119 | 0 | 4 |
| Jun | 16.8 °C | 29.3 °C | 6.8 °C | 127 | 0 | 10 |
| Jul | 18.6 °C | 30.4 °C | 9.4 °C | 134 | 0 | 14 |
| Aug | 18.5 °C | 29.8 °C | 8.9 °C | 138 | 0 | 12 |
| Sep | 14.9 °C | 25.7 °C | 5.4 °C | 90 | 0 | 2 |
| Oct | 11.6 °C | 23.3 °C | 1.2 °C | 79 | 2 | 0 |
| Nov | 6.7 °C | 19.3 °C | −3.9 °C | 91 | 12 | 0 |
| Dec | 3.5 °C | 15.3 °C | −7.5 °C | 107 | 23 | 0 |
| Year | 10.4 °C | 30.4 °C | −8.7 °C | 1266 | 101 | 42 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Pilatus (12 km, 2105 m), Engelberg (15 km, 1036 m), Meiringen (16 km, 589 m), adjusted to the elevation of Lake Sarnen (469 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Lake Lungern (10 km · 689 m)
- Weather Lake Lucerne (23 km · 434 m)
- Weather Lake Brienz (25 km · 564 m)
- Weather Lake Sempach (30 km · 504 m)
- Weather Lake Zug (35 km · 413 m)
- Weather Lake Ägeri (41 km · 724 m)
Nearby municipalities
- Weather Sarnen (6 km)
- Weather Sachseln (6 km)
- Weather Kerns (7 km)
- Weather Giswil (8 km)
- Weather Lungern (10 km)
- Weather Engelberg (12 km)
- Weather Schwarzenberg (12 km)
- Weather Alpnach (12 km)
Frequently asked questions about the weather: Lake Sarnen
What is the wind like on Lake Sarnen today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (469 m).
Can you swim in Lake Sarnen?
In summer (June to September) lowland lakes usually reach 18–24 °C at the surface; there are many public beaches and lidos. Check the air temperature, sunshine and UV index above to pick your slot.
What are the typical winds on Lake Sarnen?
Characteristic winds: Föhn, Westwind. Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake Sarnen?
The warmest month in Lake Sarnen is July, averaging 18.6 °C (1991–2020 normal). The coldest is January at 2.7 °C.
How much does it rain in Lake Sarnen per year?
Lake Sarnen receives about 1266 mm of precipitation a year. The wettest month is August (138 mm), the driest October (79 mm).
When is the best time to visit Lake Sarnen?
For warmth and sunshine: July (18.6 °C on average, — h of sun). The coldest month is January (2.7 °C). Check the 15-day forecast above for your dates.