Lac de Grand-Lieu — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lac de Grand-Lieu, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lac de Grand-Lieu today is 21.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 | 21.9°C | 24.0°C | |
| AUG 25 | 21.8°C | 24.0°C | |
| AUG 26 | 21.2°C | 24.0°C | |
| AUG 27 | 21.2°C | 24.0°C | |
| AUG 28 | 21.2°C | 24.0°C | |
| AUG 29 | 21.1°C | 24.0°C | |
| AUG 30 | 21.2°C | 24.0°C | |
| AUG 31 | 21.3°C | 24.0°C | |
| SEP 1 | 20.0°C | 21.2°C | |
| SEP 2 | 20.0°C | 21.2°C | |
| SEP 3 | 20.0°C | 21.1°C | |
| SEP 4 | 20.0°C | 21.0°C | |
| SEP 5 | 20.0°C | 21.0°C | |
| SEP 6 | 20.0°C | 20.9°C | |
| SEP 7 | 20.0°C | 20.8°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 | 3°C | 7°C | 10°C |
| February | 3°C | 7°C | 11°C |
| March | 6°C | 10°C | 13°C |
| April | 10°C | 14°C | 18°C |
| May | 12°C | 18°C | 23°C |
| June | 17°C | 23°C | 28°C |
| July | 19°C | 24°C | 29°C |
| August | 19°C | 24°C | 29°C |
| September | 14°C | 20°C | 25°C |
| October | 11°C | 15°C | 19°C |
| November | 6°C | 10°C | 14°C |
| December | 3°C | 7°C | 11°C |
Lac de Grand-Lieu: Water Temperature by Location
Lac de Grand-Lieu: Weather Forecast
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September 5
Location & Local Information
Lac de Grand-Lieu is one of the largest natural lakes in France, located near Nantes in the Loire-Atlantique department. This lake is renowned for its biodiversity, being a significant wetland area and a protected nature reserve. While it is a popular destination for birdwatching and nature walks, swimming in Lac de Grand-Lieu is not typically recommended. The lake's water temperature can reach up to 22°C (72°F) during the warmest months of summer, but it remains relatively cooler compared to other more popular swimming lakes. The water quality is not consistently monitored for recreational swimming, as the lake’s primary purpose is to serve as a habitat for wildlife.
Due to the lake's ecological importance and its role as a nature reserve, swimming is generally restricted, and access to certain areas of the lake may be limited to preserve its delicate environment. Visitors can enjoy other activities, such as hiking around the lake's perimeter or taking boat tours to explore its rich flora and fauna. While the temperature may be comfortable for short dips, the lack of designated swimming zones and the area's focus on conservation mean that swimming is not a primary activity at Lac de Grand-Lieu.