Lake Lucerne — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Lucerne, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Lucerne today is 18.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| SEP 24 | 18.4°C | 20.5°C | |
| SEP 25 | 18.2°C | 20.5°C | |
| SEP 26 | 18.0°C | 20.5°C | |
| SEP 27 | 18.5°C | 20.5°C | |
| SEP 28 | 18.8°C | 20.5°C | |
| SEP 29 | 19.4°C | 20.5°C | |
| SEP 30 | 19.0°C | 20.5°C | |
| OCT 1 | 18.8°C | 15.0°C | |
| OCT 2 | 15.0°C | 18.2°C | |
| OCT 3 | 15.0°C | 18.1°C | |
| OCT 4 | 15.0°C | 17.9°C | |
| OCT 5 | 15.0°C | 17.7°C | |
| OCT 6 | 15.0°C | 17.6°C | |
| OCT 7 | 15.0°C | 17.4°C | |
| OCT 8 | 15.0°C | 17.2°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 3°C | 7°C | 10°C |
| February | 3°C | 5°C | 7°C |
| March | 5°C | 7°C | 9°C |
| April | 6°C | 11°C | 16°C |
| May | 11°C | 17°C | 23°C |
| June | 17°C | 21°C | 26°C |
| July | 20°C | 24°C | 29°C |
| August | 19°C | 24°C | 29°C |
| September | 16°C | 21°C | 25°C |
| October | 12°C | 15°C | 18°C |
| November | 7°C | 11°C | 14°C |
| December | 4°C | 8°C | 10°C |
Lake Lucerne: Water Temperature by Location
Lake Lucerne: Weather Forecast
October 2
October 3
October 4
October 5
October 6
Location & Local Information
Lake type: freshwater fjord, recent regulation
Primary inflows: Reuss, Muota, Engelberger Aa, Sarner Aa
Primary outflows: Reuss
Catchment area: 2,124 km2 (820 sq mi)
Basin countries: Switzerland
Max. length: 30 km (19 mi)
Max. width: 20 km (12 mi)
Surface area: 113.6 km2 (43.9 sq mi)
Average depth: 104 m (341 ft)
Max. depth: 214 m (702 ft)
Water volume: 11.8 km3 (2.8 cu mi)
Residence time: 3.4 years
Shore length1: 143.7 km (89.3 mi)
Surface elevation: 434 m (1,424 ft)
Lake Lucerne is a large, fjord-like Alpine lake with deep basins and sheltered bays, which influences its water temperature throughout the year. In winter, surface temperatures typically drop to about 4–6 °C (39–43 °F). During spring, gradual warming brings the lake to around 10–14 °C (50–57 °F). The warmest period is summer, when July and August usually see surface temperatures of about 18–22 °C (64–72 °F), with occasional peaks near 23 °C (73 °F) in sheltered areas. In autumn, the lake cools slowly and often remains above 14 °C (57 °F) well into September.
Swimming in Lake Lucerne is allowed and popular, especially in the quieter bays and designated bathing areas. The water quality is high, and numerous lidos and lakeside access points make swimming safe and convenient. Because of the lake’s depth, it warms more slowly than smaller lakes but also retains heat longer. Summer offers comfortable conditions for most swimmers, while late spring and early autumn are suitable for those accustomed to cooler water.