Water temperature in Hermance

This data the coastal Hermance water temperature today, tomorrow and the upcoming days. Besides, you can also get information about the weather and surf forecast, as well as the data on sunrise / sunset and moonrise / moonset at a given point on any given day.

Current water temperature in Hermance

Water temperature in Hermance today is 18.4°C. Based on our historical data over a period of ten years, the warmest water in this day in the Lake Geneva near Hermance was recorded in 2023 and was 19.3°C, and the coldest was recorded in 2017 at 16.3°C. Water temperature in Hermance is expected to drop to 16.7°C in the next 10 days. September average water temperature in Hermance is 19.2°C, the minimum temperature is 16.1°C, and the maximum is 23.4°C.

The swimming season in Hermance lasts from July to September. During those months, Hermance water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Hermance in winter reaches 9.4°C, in spring 11.3°C, in summer the average temperature rises to 20°C, and in autumn it is 16°C.

Hermance water temperature now

Current temperature and weather

Data in a table show Hermance temperature today (26 September 2025). For more information and forecast for a few days, go to the weather forecast Hermance.

0-3 h	3-6 h	6-9 h	9-12 h
8.6°C	7.4°C	7°C	9.6°C

12-15 h	15-18 h	18-21 h	21-24 h
9.4°C	9.1°C	9.1°C	8°C

Hermance water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Hermance. In addition to the table values, the graph below displays of changes average surface temperature during the year. Values are calculated based on the data over the past 10 years. Using them, you can check the water temperature in Hermance on any day of this period that interests you. Click on the month link and you will see a table for each day, or alternatively you can view the temperature curve of the month and select 2 different years you want to compare, either in a table or as a curve

Chart monthly average water temperature in Hermance

The nearest beaches and cities from Hermance with the water temperature today, as well as the air temperature and the state of the weather during the day and the average wave height for today

	Water	Weather		Wave
Coppet	18.4°C	9°C
Messery	18.6°C	9°C
Sciez	18.7°C	9°C
Thonon-les-Bains	18.7°C	9°C
Morges	18.7°C	9°C
Evian-les-Bains	18.7°C	9°C
Lausanne	18.7°C	9°C
Vevey	18.7°C	9°C
Bourg-en-Lavaux	18.7°C	9°C
Montreux	18.7°C	6°C

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Our report for Hermance is compiled using satellite data together with in-situ observations to get the most reliable daily data of sea surface temperatures, surf forecasts, current temperatures and weather forecasts.