Lake Sempach
Lake Sempach is a Swiss lake (Lucerne) at 504 m, covering 14 km² with a maximum depth of 87 m. Typical winds: Westwind, Bise. Main shores and access points: Sempach, Sursee, Nottwil, Eich, Oberkirch. 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 Sempach: 1991–2020 normals
In Lake Sempach (504 m), the mean annual temperature is 10.4 °C. The warmest month is July (18.9 °C on average) and the coldest January (2.8 °C). About 1236 mm of precipitation falls per year, peaking in July (137 mm) with a minimum in January (79 mm). The sun shines for about 1530 hours a year, mostly in July (209 h). On average there are 76 frost days and 9 hot days (≥ 30 °C) per year. The mean monthly maximum reaches 30.4 °C and the absolute minimum −6.9 °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 | 2.8 °C | 13.6 °C | −6.9 °C | 79 | 51 | 21 | 0 |
| Feb | 2.9 °C | 14.6 °C | −6.9 °C | 80 | 80 | 19 | 0 |
| Mar | 6.0 °C | 18.0 °C | −4.4 °C | 87 | 133 | 10 | 0 |
| Apr | 9.3 °C | 21.6 °C | −1.0 °C | 100 | 162 | 2 | 1 |
| May | 13.4 °C | 25.8 °C | 3.5 °C | 129 | 173 | 0 | 4 |
| Jun | 16.9 °C | 29.2 °C | 7.3 °C | 135 | 187 | 0 | 12 |
| Jul | 18.9 °C | 30.4 °C | 10.0 °C | 137 | 209 | 0 | 16 |
| Aug | 18.7 °C | 29.8 °C | 9.3 °C | 137 | 198 | 0 | 14 |
| Sep | 14.9 °C | 25.4 °C | 5.9 °C | 93 | 146 | 0 | 3 |
| Oct | 11.3 °C | 22.4 °C | 1.6 °C | 80 | 99 | 1 | 0 |
| Nov | 6.6 °C | 17.9 °C | −2.7 °C | 83 | 53 | 7 | 0 |
| Dec | 3.6 °C | 14.4 °C | −6.1 °C | 96 | 39 | 18 | 0 |
| Year | 10.4 °C | 30.4 °C | −6.9 °C | 1236 | 1530 | 76 | 50 |
Source: MeteoSwiss open data (1991–2020 normals) — stations Luzern (16 km, 454 m), Pilatus (20 km, 2105 m), Napf (22 km, 1404 m), adjusted to the elevation of Lake Sempach (504 m) using a 0.55 °C/100 m lapse rate. Indicative, rounded values.
Swiss lakes
- Weather Lake Hallwil (16 km · 449 m)
- Weather Lake Zug (25 km · 413 m)
- Weather Lake Lucerne (28 km · 434 m)
- Weather Lake Sarnen (30 km · 469 m)
- Weather Lake Ägeri (36 km · 724 m)
- Weather Lake Lungern (39 km · 689 m)
Nearby municipalities
- Weather Nottwil (2 km)
- Weather Eich (3 km)
- Weather Oberkirch (4 km)
- Weather Schenkon (4 km)
- Weather Sempach (5 km)
- Weather Buttisholz (5 km)
- Weather Sursee (5 km)
- Weather Mauensee (6 km)
Frequently asked questions about the weather: Lake Sempach
What is the wind like on Lake Sempach today?
The “Wind on the lake” section shows hourly average wind speed, gusts and direction for the next 24 hours, computed over the lake (504 m).
Can you swim in Lake Sempach?
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 Sempach?
Characteristic winds: Westwind, Bise. Storm warnings on Swiss lakes are signalled by flashing lights (40 flashes/min = caution, 90 = storm).
What is the warmest month in Lake Sempach?
The warmest month in Lake Sempach is July, averaging 18.9 °C (1991–2020 normal). The coldest is January at 2.8 °C.
How much does it rain in Lake Sempach per year?
Lake Sempach receives about 1236 mm of precipitation a year. The wettest month is July (137 mm), the driest January (79 mm).
When is the best time to visit Lake Sempach?
For warmth and sunshine: July (18.9 °C on average, 209 h of sun). The coldest month is January (2.8 °C). Check the 15-day forecast above for your dates.