Lac du Bourget weather, forecasts and climate by season
Lac du Bourget weather forecast
15°C | °F
Spring at Lac du Bourget: softness and renewal
Visit climate at the lake and in the region (the surroundings, Aix-les-Bains) Spring is marked by a gradual return to mild weather and the awakening of the surrounding countryside. Between March and May, temperatures generally oscillate between 12°C and 20°C, with increasingly sunny days. This is the ideal season to enjoy the Alpine landscapes in full bloom, particularly around Aix-les-Bains and the shores of the lake.
Precipitation remains moderate but can be frequent, typical of a transitional climate between alpine and continental influences. Mornings can still be cool, especially in March, but afternoons quickly become pleasant. It's the perfect time of year for hiking, biking and water sports.
To remember this spring:
-
Mild temperatures (12°C to 20°C)
-
Nature in bloom
-
A few regular showers
-
Ideal for outdoor activities
Météo lac du Bourget en été: chaleur et ensoleillement
Summer is the most popular time to visit the lake. Visit climate at the lake is warm and sunny, with daytime temperatures averaging between 25°C and 30°C. The lake water can reach 24°C, making it the perfect place for a swim.
The days are long and bright, ideal for enjoying the beaches and water sports such as paddling, kayaking and sailing. However, as is often the case in mountainous areas, thunderstorms can occur at the end of the day, bringing brief but sometimes intense rain.
Summer highlights:
-
High temperatures (25°C to 30°C)
-
Warm, pleasant lake water
-
Lots of sunshine
-
Risk of thunderstorms at the end of the day
Autumn at Lac du Bourget: color and serenity
Visit climate at Lac du Bourget in autumn is particularly appreciated for its flamboyantly colored landscapes. Between September and November, temperatures gradually drop, from 22°C in September to around 10°C in November.
This season often offers beautiful sunny days, especially in early autumn, with soft light ideal for photography. Precipitation becomes more frequent as winter approaches, and mornings can be foggy around the lake.
To remember in autumn:
-
Moderate to cool temperatures (10°C to 22°C)
-
Colorful landscapes
-
Quiet, less touristy atmosphere
-
Frequent morning fog
Winter on Lac du Bourget: cool and peaceful
In winter, the climate at the lake becomes colder, with temperatures between 0°C and 8°C. Although the lake rarely freezes, the atmosphere can be misty, especially in the morning.
The days are shorter and the sunshine is variable, but the setting remains magnificent, with the surrounding mountains sometimes covered in snow. It's an ideal season to enjoy the peace and quiet, the spas at Aix-les-Bains and the nearby ski resorts.
To remember in winter:
-
Cold temperatures (0°C to 8°C)
-
Calm and relaxing atmosphere
-
Frequent fog
-
Close to ski resorts
Lac du Bourget weather summary table
| Season | Average temperatures | Sunshine | Special features |
|---|---|---|---|
| Spring | 12°C to 20°C | Fair to good | Flowering, showers |
| Summer | 25°C to 30°C | Very high | Swimming, thunderstorms |
| Autumn | 10°C to 22°C | Good | Colors, calm |
| Winter | 0°C to 8°C | Variable | Fog, nearby snow |
FAQ - Lac du Bourget weather
What's the climate like around Lac du Bourget?
Lac du Bourget enjoys a semi-continental climate mountain-influenced :
-
Warm, sunny summers
-
Cool winters with occasional fog
-
Mild but changeable shoulder seasons
When is the best time to visit Lac du Bourget?
The best period is from May to September :
-
June to August: ideal for swimming and water sports
-
May and September: perfect for hiking with fewer tourists
What is the water temperature in Lac du Bourget?
-
Spring: 12 to 18°C
-
Summer: 20 to 26°C (sometimes higher during heatwaves)
-
Autumn: 14 to 20°C
-
Winter: 5 to 10°C
Is Lac du Bourget windy?
Yes, the lake can be influenced by several winds:
-
The kiss cold, dry north wind
-
The south wind milder but sometimes unstable
These winds can create waves, especially at the end of the day.
How often does it rain on Lac du Bourget?
Precipitation is moderate but regularwith :
-
Frequent summer thunderstorms
-
Rainy spells in spring and autumn
Is there fog on the lake?
Yes, especially in autumn and winter. Fog can be dense in the morning, but usually dissipates during the day.
What are the best weather conditions for activities?
-
Swimming : temps chaud, vent faible, eau > 22°C
-
Sailing / paddle moderate and stable wind
-
Hiking Spring and autumn to avoid hot weather
Can the climate change quickly?
Yes, as is often the case in mountainous areas:
-
Summer thunderstorms can develop rapidly
-
Winds can pick up in a matter of hours
Where can I check the Lac du Bourget weather forecast live?
You can consult the forecasts at the top of this page.
-
Météo-France
-
Local weather applications
-
Weather stations around Aix-les-Bains
Français 
English 
Deutsch 