Lake Llyn Brenig — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Llyn Brenig, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Llyn Brenig today is 18.7°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 |
|---|---|---|---|
| JUL 16 | 19.5°C | 21.7°C | |
| JUL 17 | 19.0°C | 21.7°C | |
| JUL 18 | 19.0°C | 21.7°C | |
| JUL 19 | 19.0°C | 21.7°C | |
| JUL 20 | 19.0°C | 21.7°C | |
| JUL 21 | 18.7°C | 21.7°C | |
| JUL 22 | 18.7°C | 21.7°C | |
| JUL 23 | 18.7°C | 21.7°C | |
| JUL 24 | 21.7°C | 18.9°C | |
| JUL 25 | 21.7°C | 19.0°C | |
| JUL 26 | 21.7°C | 19.2°C | |
| JUL 27 | 21.7°C | 19.3°C | |
| JUL 28 | 21.7°C | 19.5°C | |
| JUL 29 | 21.7°C | 19.6°C | |
| JUL 30 | 21.7°C | 19.8°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 | 1°C | 5°C | 8°C |
| February | 1°C | 5°C | 8°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 10°C | 13°C |
| May | 9°C | 15°C | 21°C |
| June | 13°C | 20°C | 26°C |
| July | 16°C | 22°C | 27°C |
| August | 16°C | 21°C | 26°C |
| September | 12°C | 18°C | 23°C |
| October | 9°C | 13°C | 17°C |
| November | 4°C | 8°C | 11°C |
| December | 1°C | 5°C | 8°C |
Lake Llyn Brenig: Water Temperature by Location
Lake Llyn Brenig: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Llyn Brenig is a large reservoir located on the Denbigh Moors in North Wales, surrounded by rolling hills and open heathland. Sitting at an elevation of over 360 metres, the lake stays cool throughout the year due to its altitude and exposed setting. In winter, the water temperature often drops to around 3–5 °C (37–41 °F), while in spring it slowly climbs to about 8–10 °C (46–50 °F). During the summer, the surface may reach 14–16 °C (57–61 °F) on calm, sunny days, though the deeper areas remain noticeably colder. By autumn, the temperature falls again toward 9–11 °C (48–52 °F), maintaining the lake’s characteristically fresh and invigorating quality year-round.
Swimming in Llyn Brenig is officially permitted but regulated for safety reasons, as the water can be cold and conditions change quickly with the weather. Wetsuits are strongly recommended, especially outside midsummer. The lake is also widely used for sailing, kayaking, and trout fishing, and its clean water and peaceful surroundings make it popular with outdoor enthusiasts. Walking and cycling routes circle the reservoir, offering panoramic views across the moors. Nearby attractions include the Alwen Reservoir, the Clocaenog Forest, and the market towns of Denbigh and Ruthin, which provide a mix of history and natural beauty.