Lake Geneva — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Geneva, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Geneva today is 18.5°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 |
|---|---|---|---|
| JUN 5 | 19.2°C | 19.9°C | |
| JUN 6 | 18.7°C | 19.9°C | |
| JUN 7 | 18.4°C | 19.9°C | |
| JUN 8 | 18.4°C | 19.9°C | |
| JUN 10 | 18.7°C | 19.9°C | |
| JUN 11 | 18.6°C | 19.9°C | |
| JUN 12 | 18.5°C | 19.9°C | |
| JUN 13 | 19.9°C | 18.6°C | |
| JUN 14 | 19.9°C | 18.6°C | |
| JUN 15 | 19.9°C | 18.7°C | |
| JUN 16 | 19.9°C | 18.8°C | |
| JUN 17 | 19.9°C | 18.9°C | |
| JUN 18 | 19.9°C | 18.9°C | |
| JUN 19 | 19.9°C | 19.0°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 | 5°C | 9°C | 11°C |
| February | 5°C | 7°C | 8°C |
| March | 6°C | 7°C | 9°C |
| April | 6°C | 10°C | 15°C |
| May | 11°C | 15°C | 20°C |
| June | 17°C | 20°C | 24°C |
| July | 20°C | 23°C | 28°C |
| August | 20°C | 23°C | 26°C |
| September | 16°C | 21°C | 25°C |
| October | 12°C | 15°C | 18°C |
| November | 8°C | 11°C | 14°C |
| December | 6°C | 9°C | 11°C |
Lake Geneva: Water Temperature by Location
🇨🇭 Switzerland
- Anières18.7°C
- Bellevue18.1°C
- Buchillon19.3°C
- Collonge-Bellerive18.1°C
- Cologny17.8°C
- Coppet18.8°C
- Geneva16.7°C
- Genthod18.7°C
- Gland19.2°C
- La Tour-de-Peilz19.8°C
- Lausanne18.2°C
- Montreux18.8°C
- Morges18.2°C
- Nyon18.3°C
- Port-Valais19.3°C
- Prangins19.1°C
- Pregny-Chambésy18.3°C
- Rolle19.4°C
- Saint-Sulpice20.2°C
- Villeneuve19.3°C
🇫🇷 France > Auvergne-Rhône-Alpes
Lake Geneva: Weather Forecast
June 13
June 14
June 15
June 16
June 17
June 18
Location & Local Information
Lake type: Glacial lake
Primary inflows: Rhône, Dranse
Primary outflows: Rhône
Catchment area: 7,975 square kilometres (3,079 sq mi)
Basin countries: Switzerland, France
Max. length: 73 km (45 mi)
Max. width: 14 km (8.7 mi)
Surface area: 580.03 km2 (224 sq mi)
Average depth: 153.4 metres (503 feet)
Max. depth: 310 metres (1,020 feet)
Water volume: 89 km3 (72 million acre⋅ft; 21 cu mi)
Residence time: 11.4 years
Shore length1: 156 km (97 mi)
Surface elevation
Lake Geneva is one of Europe’s largest Alpine lakes and strongly influences the local climate along its shores. Its large volume causes water temperatures to change slowly over the year. In winter, surface temperatures typically range from about 5–7 °C (41–45 °F). During spring, gradual warming brings temperatures to around 10–15 °C (50–59 °F). The warmest period is summer, when July and August usually see water temperatures of about 20–24 °C (68–75 °F), with occasional peaks near 25 °C (77 °F) during heatwaves. In autumn, the lake cools slowly and often remains above 15 °C (59 °F) into October.
Swimming in Lake Geneva is fully allowed and very popular. The lake has excellent water quality and many public beaches, lidos, and accessible shorelines. Thanks to its depth and thermal stability, Lake Geneva offers one of the longest swimming seasons in Switzerland. Summer conditions are comfortable for all swimmers, while late spring and early autumn remain suitable for those accustomed to cooler water.