River Taff — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the River Taff, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the River Taff today is 14.1°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 24 | 13.4°C | 17.9°C | |
| JUN 25 | 13.4°C | 17.9°C | |
| JUN 26 | 13.4°C | 17.9°C | |
| JUN 27 | 13.7°C | 17.9°C | |
| JUN 28 | 13.7°C | 17.9°C | |
| JUN 29 | 13.3°C | 17.9°C | |
| JUN 30 | 13.9°C | 17.9°C | |
| JUL 1 | 14.1°C | 20.0°C | |
| JUL 2 | 20.0°C | 14.4°C | |
| JUL 3 | 20.0°C | 14.7°C | |
| JUL 4 | 20.0°C | 15.0°C | |
| JUL 5 | 20.0°C | 15.3°C | |
| JUL 6 | 20.0°C | 15.6°C | |
| JUL 7 | 20.0°C | 15.9°C | |
| JUL 8 | 20.0°C | 16.2°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 | 2°C | 6°C | 9°C |
| February | 3°C | 7°C | 9°C |
| March | 5°C | 9°C | 11°C |
| April | 7°C | 11°C | 14°C |
| May | 9°C | 14°C | 18°C |
| June | 11°C | 18°C | 24°C |
| July | 16°C | 20°C | 25°C |
| August | 15°C | 19°C | 24°C |
| September | 13°C | 18°C | 22°C |
| October | 9°C | 13°C | 16°C |
| November | 5°C | 9°C | 11°C |
| December | 3°C | 7°C | 9°C |
River Taff: Water Temperature by Location
River Taff: Weather Forecast
July 1
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July 4
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July 6
Location & Local Information
Source Taf Fawr
• location Corn Du, Brecon Beacons, Powys, Wales
Mouth Cardiff Bay
• location Cardiff, Wales
Length 67 km (42 mi)
The River Taff flows from the Brecon Beacons in South Wales to Cardiff Bay, passing through valleys, forests, and urban landscapes along its course. Its water temperature reflects the cool, temperate Welsh climate and changes notably with the seasons. In winter, the river is cold, averaging around 4–6 °C (39–43 °F), while spring brings a slow rise to 8–10 °C (46–50 °F). During the summer months, the upper stretches may reach 15–17 °C (59–63 °F), though shaded areas and faster currents stay cooler. By autumn, temperatures fall again toward 9–11 °C (48–52 °F), with rainfall and river flow influencing the daily variation.
Swimming in the River Taff is permitted in some areas, though it is best suited to experienced wild swimmers who understand the risks of changing currents and water quality. Popular and safe spots tend to be upstream near Pontypridd and in calmer pools within the Brecon Beacons National Park, where the water is clearer and more sheltered. In Cardiff, swimming is discouraged due to urban runoff and boat traffic. Wetsuits are often used outside midsummer for warmth. The river’s surroundings offer scenic walking and cycling routes, and nearby attractions include Castell Coch, Pontcana Fields, and the lively Cardiff waterfront.