Lake Bourget water temperature and level today
The largest natural lake entirely in France, Lake Bourget lines Aix-les-Bains. Its level is regulated and moves by a few tens of centimetres through the year.
At a glance
- Altitude
- 231 m
- Surface area
- 44.5 km²
- Maximum depth
- 145 m
- Location
- Savoie, French Alps
Summer 2026
The water peaked at 23.5 °C. In July and August our readings averaged 22.2 °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 Bourget today?
The temperature is updated daily at the top of this page. In summer 2026 the water reached 23.5 °C, averaging 22.2 °C in July and August.
When is the water warmest in Lake Bourget?
Usually from mid-July to late August. The lake warms from May and cools clearly from late September.
What is the water level in Lake Bourget today?
Today's level is shown at the top of this page in metres above sea level, with the gap to the lake's reference level. The history shows 30 days, 90 days, 1 year and 3 years.
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.