World Resorts Switzerland Lake Geneva Weather

Lake Geneva Sea Temperature in September

Average sea water temperature in September:
+65.8°F
Minimum sea water temperature in September: 74.8°F
Maximum sea water temperature in September: 32.0°F

Daily sea water temperature in September, °F

Show year:
2025
2024
2023

The average sea water temperature in September of 2025 was 68.0°F. The highest and lowest sea temperatures during the month were 71.2°F and 65.1°F.

Monthly sea water temperature in Lake Geneva, °F

Which Switzerland resorts have warmest sea in September?

Place name September 2025 September 2024
Montreux 68.5°F 68.9°F
Gstaad 68.5°F 68.9°F
Verbier 68.5°F 68.9°F
Vevey 68.4°F 68.9°F
Lausanne 68.1°F 68.7°F
Lake Geneva 68.0°F 68.4°F
Zurich 67.6°F 68.7°F
Winterthur 67.6°F 68.7°F
Geneva 66.9°F 67.2°F
St Gallen 66.8°F 67.8°F

Best time for vacation in Lake Geneva

Sunniest months:
August 19 days
July 16 days
September 16 days
Warmest months:
August 74.4 °F
July 73.7 °F
June 69.5 °F
Warmest sea temp:
August 69.8 °F
July 68.6 °F
September 65.8 °F
Coldest months:
January 38.6 °F
December 41.0 °F
February 41.8 °F
Rainiest months:
June 7 days
May 7 days
July 6 days
Windiest months:
January 6.5 mph
February 6.0 mph
December 5.8 mph

Lake Geneva on a weather map

Current weather
08:14
Lake Geneva
+39°F
S 4 mph
Feels like: +36°F
Precip.: 100%
Places in Switzerland:
Name
°F
Basle
+39°F
Berne
+36°F
Vevey
+30°F
Verbier
+21°F
Winterthur
+36°F
Gstaad
+32°F
Geneva
+37°F
Lake Geneva
+39°F
Lausanne
+39°F
Lugano
+43°F
Lucerne
+30°F
Montreux
+30°F
St Gallen
+36°F
Zermatt
+16°F
Zurich
+36°F
all places
24 Hours Forecast
Lake Geneva
Local time: 08:14
December 05, friday
0900
39°F
S
4 mph
1200
41°F
SW
3 mph
1500
43°F
W
2 mph
1800
41°F
W
2 mph
2100
39°F
NE
3 mph
December 06, saturday
0000
37°F
NE
6 mph
0300
39°F
NE
7 mph
0600
41°F
NE
9 mph
Units of measurement: °C / °F