Lake Geneva water temperature today
The largest lake in Western Europe, shared by France and Switzerland. We follow the water temperature near Sciez on the French shore and near Préverenges, by Lausanne.
At a glance
- Altitude
- 372 m
- Surface area
- 580 km²
- Maximum depth
- 310 m
- Location
- France and Switzerland
Summer 2026
The water peaked at 23.2 °C. In July and August our readings averaged 21.7 °C.
Is it warm enough to swim?
Above 22 °C the water feels pleasant to almost everyone. Between 18 and 22 °C swimming is fine but refreshing. Below 18 °C a wetsuit helps for longer swims, and below 14 °C it becomes essential for water sports.
Frequently asked questions
What is the water temperature in Lake Geneva today?
The temperature is updated daily at the top of this page. In summer 2026 the water reached 23.2 °C, averaging 21.7 °C in July and August.
When is the water warmest in Lake Geneva?
Usually from mid-July to late August. The lake warms from May and cools clearly from late September.
How can I show this temperature on my website?
With the Lakemetric API: one request with the latitude and longitude of the lake or beach returns the temperature, the level and the reading date. A free key covers one lake or spot.
Other lakes and beaches
Show this temperature on your website
The same data is available through the API: send a GPS point, get the temperature, the level and the reading date as JSON. Free key, no card.