Water temperature in Rennes

This data the coastal Rennes 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 Rennes

Water temperature in Rennes today is 13°C. Based on our historical data over a period of ten years, the warmest water in this day in Rennes was recorded in 2023 and was 17°C, and the coldest 13°C. Water temperature in Rennes is expected to rise to 14.2°C in the next 10 days. September average water temperature in Rennes is 17.5°C, the minimum temperature is 13°C, and the maximum is 24°C.

The swimming season in Rennes lasts only one month - August. During this month, Rennes water temperature does not drop below 20°C and therefore suitable for comfortable swimming. The average water temperature in Rennes in winter reaches 6.8°C, in spring 10.8°C, in summer the average temperature rises to 18.6°C, and in autumn it is 13.8°C.

Rennes water temperature now

Current temperature and weather

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

0-3 h	3-6 h	6-9 h	9-12 h
8.8°C	10.7°C	10.6°C	11.9°C

12-15 h	15-18 h	18-21 h	21-24 h
16.4°C	15.1°C	15.4°C	12.2°C

Rennes water temperature by month

These figures shows the average, minimum and maximum monthly water temperature in Rennes. 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 Rennes 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 Rennes

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Our report for Rennes 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.