Rennes — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Rennes, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Rennes today is 18.6°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. It is important to note that these swimming tips and recommendations apply only in good weather. When the air temperature is below 68°F (20°C), and sometimes even below 77°F (25°C), swimming can be unpleasant even with relatively high water temperatures.
Water Temperature Chart Over the Last 30 Days
Table of Daily Sea Temperature Data
| Date | Current | Average | Forecast |
|---|---|---|---|
| AUG 24 | 19.0°C | 17.6°C | |
| AUG 25 | 18.3°C | 17.6°C | |
| AUG 26 | 18.3°C | 17.6°C | |
| AUG 27 | 18.3°C | 17.6°C | |
| AUG 28 | 18.2°C | 17.6°C | |
| AUG 29 | 18.2°C | 17.6°C | |
| AUG 30 | 18.3°C | 17.6°C | |
| AUG 31 | 18.6°C | 17.6°C | |
| SEP 1 | 16.0°C | 18.5°C | |
| SEP 2 | 16.0°C | 18.3°C | |
| SEP 3 | 16.0°C | 18.2°C | |
| SEP 4 | 16.0°C | 18.1°C | |
| SEP 5 | 16.0°C | 18.0°C | |
| SEP 6 | 16.0°C | 17.8°C | |
| SEP 7 | 16.0°C | 17.7°C |
* Current - Actual water temperature value
** Average - Average water temperature on this day in recent years
*** Forecast - Our water temperature forecast
Actual nearshore water temperatures may fluctuate by several degrees from the reported values, especially following heavy rainfall or extended periods of strong winds. Certain wind patterns can cause colder, deeper waters to rise and replace the sun-warmed surface water, leading to noticeable variations.
Our forecast is based on a proprietary mathematical model that considers real-time water temperature changes, historical trends, key weather patterns, wind strength and direction, and air temperature specific to each region. Additionally, we incorporate data from other resorts to enhance accuracy.
Monthly Water Temperature Range (Min, Max & Average)
| Month | Min | Avg | Max |
|---|---|---|---|
| January | 2°C | 6°C | 9°C |
| February | 2°C | 6°C | 9°C |
| March | 5°C | 9°C | 11°C |
| April | 8°C | 11°C | 14°C |
| May | 9°C | 14°C | 18°C |
| June | 13°C | 18°C | 22°C |
| July | 16°C | 20°C | 25°C |
| August | 13°C | 18°C | 23°C |
| September | 11°C | 16°C | 20°C |
| October | 8°C | 11°C | 14°C |
| November | 5°C | 9°C | 12°C |
| December | 3°C | 6°C | 9°C |
Rennes: Weather Forecast
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September 3
September 4
September 5
Location & Local Information
Rennes, the capital of Brittany in France, is situated along the Vilaine River. The Vilaine's water temperature in Rennes ranges from around 5–10°C (41–50°F) during the winter months to 15–20°C (59–68°F) in summer. While these temperatures can be refreshing in warmer seasons, the Vilaine River is generally not used for swimming within Rennes due to safety and water quality concerns.
Swimming in the Vilaine within Rennes is not encouraged, primarily due to water pollution from urban runoff and limited monitoring. However, the river and its surrounding pathways are popular for walking, cycling, and kayaking. For those looking to swim, there are several managed pools and recreational lakes nearby, such as Étang d’Apigné, where water quality and safety measures are maintained, offering a safer and more enjoyable experience.