Llandegfedd Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Llandegfedd Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Llandegfedd Reservoir today is 13.8°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| JUN 25 | 13.2°C | 19.7°C | |
| JUN 26 | 13.2°C | 19.7°C | |
| JUN 27 | 13.6°C | 19.7°C | |
| JUN 28 | 13.6°C | 19.7°C | |
| JUN 29 | 13.2°C | 19.7°C | |
| JUN 30 | 13.6°C | 19.7°C | |
| JUL 1 | 13.8°C | 21.4°C | |
| JUL 2 | 13.8°C | 21.4°C | |
| JUL 3 | 21.4°C | 14.2°C | |
| JUL 4 | 21.4°C | 14.6°C | |
| JUL 5 | 21.4°C | 14.9°C | |
| JUL 6 | 21.4°C | 15.3°C | |
| JUL 7 | 21.4°C | 15.7°C | |
| JUL 8 | 21.4°C | 16.1°C | |
| JUL 9 | 21.4°C | 16.5°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 | 9°C | 16°C | 22°C |
| June | 11°C | 20°C | 28°C |
| July | 13°C | 21°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 | 5°C | 10°C | 13°C |
| December | 4°C | 8°C | 11°C |
Llandegfedd Reservoir: Water Temperature by Location
Llandegfedd Reservoir: Weather Forecast
July 3
July 4
July 5
July 6
Location & Local Information
Llandegfedd Reservoir, a vast body of water set in the beautiful Usk Valley, offers controlled open water swimming, but with strict safety guidelines, as unauthorized swimming in this Welsh Water site is prohibited due to hidden dangers like machinery and strong currents. Swimming is only permitted during designated, lifeguard-assisted sessions in a strictly defined area. The water temperature fluctuates seasonally; in winter, the lake can be very cold, occasionally dipping to around 7∘C (45∘F), while in the summer, certain sessions run when the temperature reaches 18∘C (64∘F) or warmer.
The reservoir’s visitor centre acts as a hub for various activities beyond swimming. It offers other water sports like windsurfing, sailing, and paddleboarding, with equipment available for hire. On land, visitors can explore the many walking trails around the lake, try their hand at fishing for rainbow and brown trout, or enjoy panoramic views from the lakeside cafe. The area is also a designated Site of Special Scientific Interest for its important wildlife and overwintering bird populations.