Queen Elizabeth II Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Queen Elizabeth II Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Queen Elizabeth II Reservoir today is 17.5°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 |
|---|---|---|---|
| SEP 15 | 18.2°C | 21.0°C | |
| SEP 16 | 18.7°C | 21.0°C | |
| SEP 17 | 18.8°C | 21.0°C | |
| SEP 18 | 18.7°C | 21.0°C | |
| SEP 19 | 17.6°C | 21.0°C | |
| SEP 20 | 17.7°C | 21.0°C | |
| SEP 21 | 18.4°C | 21.0°C | |
| SEP 22 | 18.0°C | 21.0°C | |
| SEP 23 | 21.0°C | 17.7°C | |
| SEP 24 | 21.0°C | 17.9°C | |
| SEP 25 | 21.0°C | 18.0°C | |
| SEP 26 | 21.0°C | 18.2°C | |
| SEP 27 | 21.0°C | 18.4°C | |
| SEP 28 | 21.0°C | 18.6°C | |
| SEP 29 | 21.0°C | 18.7°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 | 9°C | 13°C | 17°C |
| May | 11°C | 17°C | 22°C |
| June | 14°C | 21°C | 28°C |
| July | 19°C | 24°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 | 9°C | 13°C |
| December | 4°C | 8°C | 11°C |
Queen Elizabeth II Reservoir: Water Temperature by Location
Queen Elizabeth II Reservoir: Weather Forecast
September 23
September 24
September 25
September 26
September 27
Location & Local Information
#Surrey
Queen Elizabeth II Reservoir, part of the Thames Water supply network in Surrey, is a large, deep body of water whose temperatures vary with the seasons. In spring surface temperatures typically sit around 6–12 °C (43–54 °F) as the water slowly warms; summer sees the warmest readings, commonly 16–22 °C (61–72 °F), occasionally reaching the mid-20s °C (mid-70s °F) in hot spells. Autumn brings cooling back to roughly 8–14 °C (46–57 °F), and winter surface temperatures often fall to about 2–7 °C (36–45 °F), with colder layers at depth year-round.
Swimming at the reservoir is not permitted because it is an operational drinking-water facility and presents safety risks: deep, cold water, steep or slippery banks, submerged structures and variable currents can cause cold shock and drowning. Access is managed to protect water quality and infrastructure. Visitors more commonly enjoy the surrounding towpaths and riverside walks, or travel a short distance to nearby Walton-on-Thames and Weybridge for cafes and pubs, and to historic sites such as Hampton Court Palace and local parks for leisure.