Runcorn — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Runcorn, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Runcorn today is 17.3°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 16.8°C | 18.0°C | |
| AUG 27 | 16.8°C | 18.0°C | |
| AUG 28 | 16.8°C | 18.0°C | |
| AUG 29 | 16.8°C | 18.0°C | |
| AUG 30 | 17.0°C | 18.0°C | |
| AUG 31 | 17.0°C | 18.0°C | |
| SEP 1 | 17.0°C | 16.0°C | |
| SEP 2 | 16.9°C | 16.0°C | |
| SEP 3 | 16.0°C | 17.2°C | |
| SEP 4 | 16.0°C | 17.2°C | |
| SEP 5 | 16.0°C | 17.1°C | |
| SEP 6 | 16.0°C | 17.0°C | |
| SEP 7 | 16.0°C | 17.0°C | |
| SEP 8 | 16.0°C | 16.9°C | |
| SEP 9 | 16.0°C | 16.8°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 | 9°C | 12°C |
| May | 9°C | 14°C | 18°C |
| June | 14°C | 18°C | 23°C |
| July | 15°C | 19°C | 24°C |
| August | 14°C | 18°C | 23°C |
| September | 11°C | 16°C | 20°C |
| October | 9°C | 12°C | 15°C |
| November | 4°C | 7°C | 10°C |
| December | 1°C | 5°C | 8°C |
Runcorn: Weather Forecast
September 3
September 4
September 5
September 6
September 7
September 8
Location & Local Information
Runcorn, a town in Cheshire, sits on the upper tidal reach of the River Mersey, where the river begins to widen toward its estuary near Liverpool. The water here reflects the region’s maritime climate, influenced by both inland flow and tidal mixing. In winter, the Mersey around Runcorn typically measures between 5 and 7°C (41–45°F), remaining cold and fast-moving. By spring, it gradually warms to about 9–11°C (48–52°F). During midsummer—particularly in July and August—the water can reach 16–18°C (61–64°F) in calm conditions, though tidal changes often make it feel cooler. As autumn arrives, the river cools again to around 10–12°C (50–54°F), maintaining a steady freshness throughout much of the year.
Swimming in the River Mersey near Runcorn is possible but generally not advised due to strong tides, variable depths, and limited visibility. The tidal flow can shift rapidly, and industrial activity along parts of the river adds further challenges. Wild swimming is safer in nearby lakes or controlled open-water venues. For those who prefer to stay by the shore, the Mersey offers pleasant walking and cycling routes with views of the Silver Jubilee Bridge. Nearby attractions include Norton Priory Museum, Runcorn Hill Park, and access to the wider Mersey Valley Trail.