Nant-y-Moch Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Nant-y-Moch Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Nant-y-Moch Reservoir today is 11.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used. 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 3 | 12.2°C | 18.5°C | |
| JUN 4 | 12.2°C | 18.5°C | |
| JUN 5 | 12.2°C | 18.5°C | |
| JUN 6 | 12.2°C | 18.5°C | |
| JUN 7 | 11.9°C | 18.5°C | |
| JUN 8 | 11.9°C | 18.5°C | |
| JUN 10 | 11.9°C | 18.5°C | |
| JUN 11 | 18.5°C | 12.2°C | |
| JUN 12 | 18.5°C | 12.6°C | |
| JUN 13 | 18.5°C | 12.9°C | |
| JUN 14 | 18.5°C | 13.2°C | |
| JUN 15 | 18.5°C | 13.6°C | |
| JUN 16 | 18.5°C | 13.9°C | |
| JUN 17 | 18.5°C | 14.2°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 | 0°C | 3°C | 6°C |
| February | 0°C | 4°C | 7°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 10°C | 13°C |
| May | 8°C | 15°C | 22°C |
| June | 11°C | 19°C | 25°C |
| July | 16°C | 21°C | 26°C |
| August | 16°C | 21°C | 26°C |
| September | 11°C | 17°C | 22°C |
| October | 8°C | 12°C | 15°C |
| November | 3°C | 7°C | 10°C |
| December | 0°C | 4°C | 7°C |
Nant-y-Moch Reservoir: Water Temperature by Location
Nant-y-Moch Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
Nant-y-moch Reservoir, located high in the Cambrian Mountains near Pumlumon, is a remote and essential part of the Rheidol Hydro Electric Scheme. As a working reservoir, it is extremely dangerous for swimming, and unauthorised access to the water is prohibited by the operators due to significant safety hazards. The water is often very deep and cold throughout the year, with temperatures in winter likely dropping towards 4∘C to 8∘C (39∘F to 46∘F). Even in the peak of summer, surface temperatures in this exposed, high-altitude location rarely exceed 14∘C to 17∘C (57∘F to 63∘F), creating a constant risk of cold water shock.
The reservoir's dramatic surroundings make it a popular spot for fishing (with a permit) and mountain biking, with trails offering commanding views over the water. Nearby attractions include the Bwlch Nant yr Arian Visitor Centre, famous for its daily Red Kite feeding, the spectacular Devil's Bridge Falls, and the Vale of Rheidol Railway, a narrow-gauge steam train that runs through the picturesque valley to the coastal town of Aberystwyth.