William Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in William Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in William Lake today is 29.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature is above 82°F (28°C). This is very warm water, which may feel almost hot to most people. Swimming in such conditions is perfect for those seeking relaxation and comfort in the water. These waters are often preferred for relaxation in hot weather, as the water temperature does not cool the body significantly. However, it is important to remember that in such warm waters, caution is necessary, as prolonged exposure without rest can lead to overheating. 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 4 | 31.1°C | 27.8°C | |
| AUG 5 | 31.0°C | 27.8°C | |
| AUG 6 | 29.3°C | 27.8°C | |
| AUG 7 | 29.0°C | 27.8°C | |
| AUG 8 | 29.0°C | 27.8°C | |
| AUG 9 | 28.9°C | 27.8°C | |
| AUG 10 | 29.0°C | 27.8°C | |
| AUG 11 | 29.1°C | 27.8°C | |
| AUG 12 | 27.8°C | 29.0°C | |
| AUG 13 | 27.8°C | 29.0°C | |
| AUG 14 | 27.8°C | 28.9°C | |
| AUG 15 | 27.8°C | 28.8°C | |
| AUG 16 | 27.8°C | 28.8°C | |
| AUG 17 | 27.8°C | 28.7°C | |
| AUG 18 | 27.8°C | 28.6°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 | 6°C | 12°C | 18°C |
| February | 6°C | 11°C | 17°C |
| March | 11°C | 16°C | 22°C |
| April | 17°C | 20°C | 24°C |
| May | 18°C | 23°C | 28°C |
| June | 17°C | 24°C | 31°C |
| July | 24°C | 29°C | 33°C |
| August | 23°C | 28°C | 33°C |
| September | 23°C | 27°C | 31°C |
| October | 21°C | 27°C | 32°C |
| November | 14°C | 18°C | 21°C |
| December | 11°C | 15°C | 18°C |
William Lake: Water Temperature by Location
William Lake: Weather Forecast
August 12
August 13
August 14
August 15
August 16
Location & Local Information
William (Bill) Dannelly Reservoir, also known simply as Dannelly Reservoir or Millers Ferry Lake, is located on the Alabama River in the south-central part of the state. The reservoir experiences warm water temperatures for much of the year due to Alabama’s humid subtropical climate. During winter, surface temperatures typically range from 48 to 55°F (9–13°C), remaining cool but not excessively cold. As spring arrives, the lake warms quickly, reaching 63–72°F (17–22°C) by May. In midsummer, surface waters reach their seasonal peak, averaging 82–86°F (28–30°C) in July and August, creating ideal conditions for swimming and boating. During autumn, temperatures slowly decline to around 68–74°F (20–23°C) before cooling further toward winter.
Swimming is allowed and popular in William (Bill) Dannelly Reservoir, especially during the long, warm season that extends from late May through early October. The reservoir’s calm waters, sheltered coves, and sandy shorelines make it suitable for families and recreational swimmers. Several public parks and campgrounds along the shoreline, including those managed by the U.S. Army Corps of Engineers, provide safe access points and designated areas for swimming. Visitors should be mindful of occasional boat traffic and changing water levels, but overall, the reservoir offers a comfortable and scenic environment for summer swimming and relaxation.