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 22.4°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 2 | 22.6°C | 20.5°C | |
| SEP 3 | 22.1°C | 20.5°C | |
| SEP 4 | 22.1°C | 20.5°C | |
| SEP 5 | 22.1°C | 20.5°C | |
| SEP 6 | 22.7°C | 20.5°C | |
| SEP 7 | 22.8°C | 20.5°C | |
| SEP 8 | 22.9°C | 20.5°C | |
| SEP 9 | 22.9°C | 20.5°C | |
| SEP 10 | 20.5°C | 22.3°C | |
| SEP 11 | 20.5°C | 22.2°C | |
| SEP 12 | 20.5°C | 22.1°C | |
| SEP 13 | 20.5°C | 22.0°C | |
| SEP 14 | 20.5°C | 21.9°C | |
| SEP 15 | 20.5°C | 21.8°C | |
| SEP 16 | 20.5°C | 21.7°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 | 27°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
- Anières22.7°C
- Bellevue22.4°C
- Buchillon22.2°C
- Collonge-Bellerive22.8°C
- Cologny22.8°C
- Coppet22.5°C
- Geneva23.0°C
- Genthod22.4°C
- Gland22.2°C
- La Tour-de-Peilz22.8°C
- Lausanne22.4°C
- Montreux19.5°C
- Morges21.6°C
- Nyon22.9°C
- Port-Valais22.6°C
- Prangins21.7°C
- Pregny-Chambésy22.6°C
- Rolle22.3°C
- Saint-Sulpice22.3°C
- Villeneuve22.5°C
🇫🇷 France > Auvergne-Rhône-Alpes
Lake Geneva: Weather Forecast
September 10
September 11
September 12
September 13
September 14
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.