Measurements:
°C
°F
Lake Geneva
42°F
S 4 mph
Feels like: 40°F
Precip: 100%
World Resorts Switzerland Lake Geneva Weather

Lake Geneva Sea Water Temperature

Current Sea Water Temperature:
+46.4°F
Maximum Sea Water Temperature in March: 51.6°F
Minimum Sea Water Temperature in March: 30.0°F
Average water temperature in March: 43.6°F

Sea Water Temperature for the Last 10 Days:

February 28 46.4°F February 23 44.0°F
February 27 46.6°F February 22 44.2°F
February 26 46.4°F February 21 43.6°F
February 25 46.0°F February 20 43.8°F
February 24 44.8°F February 19 43.8°F

When is the Warmest Sea for Lake Geneva?

According to our data for the last three years for Lake Geneva the highest average sea water temperature was in August, July and September.

Average Water Temperature by Month, °F

Sea Water Temperature in August

Select Year: 2025 2024 2023

The average sea surface temperature in August 2025 for Lake Geneva was 75.0°F. The maximum and minimum values were 72.0°F and 78.4°F respectively.

Sea Water Temperature in July

Select Year: 2025 2024 2023

The average sea surface temperature in July 2025 for Lake Geneva was 74.3°F. The maximum and minimum values were 71.6°F and 77.0°F respectively.

Sea Water Temperature in September

Select Year: 2025 2024 2023

The average sea surface temperature in September 2025 for Lake Geneva was 70.0°F. The maximum and minimum values were 66.8°F and 73.6°F respectively.

Best Time to Visit Lake Geneva
The most sunny months:
August 19 days
July 16 days
September 16 days
The most warm months:
August 77.1 °F
July 76.3 °F
June 71.6 °F
Warmest sea temperature:
August 72.0 °F
July 70.7 °F
September 67.6 °F
The most cold months:
January 37.4 °F
December 40.2 °F
February 41.2 °F
The most rainy months:
June 7 days
May 7 days
July 6 days
The most windy months:
January 6 mph
February 6 mph
December 6 mph

Lake Geneva on the Weather Map

Switzerland Resorts:
NAME
Basle +44
Berne +40
Geneva +42
Gstaad +36
Lake Geneva +42
Lausanne +40
Lucerne +42
Lugano +48
Montreux +34
St Gallen +42
St Moritz +30
Verbier +32
Vevey +34
Winterthur +44
Zurich +42
24 Hours Weather Forecast
Lake Geneva
Local time: 02:07
01 mar, sunday
0300 42°F
S
4 mph
0600 42°F
SW
4 mph
0900 44°F
S
5 mph
1200 46°F
SW
4 mph
1500 48°F
SW
3 mph
1800 46°F
SW
2 mph
2100 38°F
S
4 mph
02 mar, monday
0000 36°F
SW
2 mph