Blagdon Lake — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Blagdon Lake, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Blagdon Lake today is 18.4°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 |
|---|---|---|---|
| AUG 26 | 18.7°C | 23.0°C | |
| AUG 27 | 18.7°C | 23.0°C | |
| AUG 28 | 18.7°C | 23.0°C | |
| AUG 29 | 18.7°C | 23.0°C | |
| AUG 30 | 18.7°C | 23.0°C | |
| AUG 31 | 18.7°C | 23.0°C | |
| SEP 1 | 18.1°C | 21.0°C | |
| SEP 2 | 18.4°C | 21.0°C | |
| SEP 3 | 21.0°C | 18.5°C | |
| SEP 4 | 21.0°C | 18.7°C | |
| SEP 5 | 21.0°C | 18.8°C | |
| SEP 6 | 21.0°C | 18.9°C | |
| SEP 7 | 21.0°C | 19.1°C | |
| SEP 8 | 21.0°C | 19.2°C | |
| SEP 9 | 21.0°C | 19.3°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 | 4°C | 8°C | 11°C |
| March | 6°C | 10°C | 13°C |
| April | 8°C | 13°C | 17°C |
| May | 10°C | 16°C | 22°C |
| June | 12°C | 20°C | 28°C |
| July | 14°C | 22°C | 29°C |
| August | 18°C | 23°C | 28°C |
| September | 16°C | 21°C | 26°C |
| October | 11°C | 15°C | 19°C |
| November | 6°C | 10°C | 13°C |
| December | 4°C | 8°C | 11°C |
Blagdon Lake: Water Temperature by Location
Blagdon Lake: Weather Forecast
September 3
September 4
September 5
September 6
September 7
Location & Local Information
#Somerset
Blagdon Lake is a shallow reservoir on the northern edge of the Mendips, so its water temperature varies with the seasons. In winter surface temperatures commonly sit around 4–8 °C (39–46 °F), rising through spring to roughly 6–14 °C (43–57 °F). In summer the lake can warm to about 15–22 °C (59–72 °F) on fine days, then cool again in autumn to around 9–14 °C (48–57 °F). These ranges are typical for an exposed upland reservoir and can vary with weather, depth and day-to-day conditions; deeper water remains colder.
Public swimming at Blagdon Lake is generally not permitted. The site functions as a drinking-water reservoir and is managed for water supply and recreation such as sailing and angling, so access to free swimming is restricted for safety and water-quality reasons. Hazards include cold-water shock, submerged structures and boat traffic, which is why organised water sports are regulated. Nearby attractions make the area worth visiting even without open-water swimming: the Mendip Hills and Cheddar Gorge offer dramatic walking and caving, and Chew Valley Lake is close by for birdwatching and alternative waterside recreation.