Grand Bayou Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Grand Bayou Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Grand Bayou Reservoir today is 19.4°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 |
|---|---|---|---|
| OCT 26 | 22.0°C | 25.5°C | |
| OCT 27 | 21.7°C | 25.5°C | |
| OCT 28 | 21.1°C | 25.5°C | |
| OCT 29 | 20.8°C | 25.5°C | |
| OCT 30 | 21.3°C | 25.5°C | |
| OCT 31 | 21.4°C | 25.5°C | |
| NOV 1 | 21.0°C | 17.0°C | |
| NOV 2 | 19.5°C | 17.0°C | |
| NOV 3 | 17.0°C | 19.3°C | |
| NOV 4 | 17.0°C | 19.2°C | |
| NOV 5 | 17.0°C | 19.0°C | |
| NOV 6 | 17.0°C | 18.9°C | |
| NOV 7 | 17.0°C | 18.8°C | |
| NOV 8 | 17.0°C | 18.7°C | |
| NOV 9 | 17.0°C | 18.6°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 | 7°C | 12°C | 17°C |
| February | 8°C | 11°C | 15°C |
| March | 7°C | 13°C | 20°C |
| April | 10°C | 17°C | 24°C |
| May | 20°C | 25°C | 29°C |
| June | 24°C | 29°C | 33°C |
| July | 24°C | 28°C | 33°C |
| August | 24°C | 29°C | 33°C |
| September | 26°C | 30°C | 33°C |
| October | 22°C | 26°C | 29°C |
| November | 11°C | 17°C | 23°C |
| December | 8°C | 12°C | 16°C |
Grand Bayou Reservoir: Water Temperature by Location
Grand Bayou Reservoir: Weather Forecast
November 3
November 4
November 5
November 6
November 7
Location & Local Information
The Lake of Grand Bayou Reservoir in Louisiana typically follows the seasonal patterns common to small Southern reservoirs, with water temperatures rising and falling with the air temperature. In winter months the surface water often sits in the lower 50s to around 60°F (about 10–16°C). Spring brings a steady warming, with temperatures commonly in the 60s to mid-70s°F (roughly 16–24°C). By summer the surface can reach the upper 70s into the 80s°F and occasionally approach 90°F in shallow bays (around 25–32°C). In autumn the lake cools again, generally dropping back into the 60s to low 70s°F (16–23°C). These ranges can vary year to year depending on weather, depth, and local inflows.
Swimming at Grand Bayou Reservoir is possible during the warmer months where public access and designated areas exist, but it is subject to local rules and conditions. Some reservoirs permit recreational swimming, while others limit or prohibit it because of public-safety concerns (such as submerged hazards or boat traffic), water-quality issues including bacterial contamination or algal blooms, or because the reservoir serves as a drinking-water source. Visitors should check signage and local management guidance before entering the water, and avoid swimming when water is unusually warm and discolored, which can increase health risks.