Queen Mary Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Queen Mary Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Queen Mary Reservoir today is 15.1°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 |
|---|---|---|---|
| JUN 3 | 16.4°C | 21.6°C | |
| JUN 4 | 16.4°C | 21.6°C | |
| JUN 5 | 16.5°C | 21.6°C | |
| JUN 6 | 16.5°C | 21.6°C | |
| JUN 7 | 16.3°C | 21.6°C | |
| JUN 8 | 15.2°C | 21.6°C | |
| JUN 10 | 15.2°C | 21.6°C | |
| JUN 11 | 21.6°C | 15.4°C | |
| JUN 12 | 21.6°C | 15.8°C | |
| JUN 13 | 21.6°C | 16.1°C | |
| JUN 14 | 21.6°C | 16.4°C | |
| JUN 15 | 21.6°C | 16.7°C | |
| JUN 16 | 21.6°C | 17.1°C | |
| JUN 17 | 21.6°C | 17.4°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 | 15°C | 22°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 Mary Reservoir: Water Temperature by Location
Queen Mary Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
#Surrey
Queen Mary Reservoir’s surface temperatures vary with the seasons and local weather. In winter the water typically sits around 4–8 °C (39–46 °F), rising through spring to roughly 6–14 °C (43–57 °F). By summer the top layers commonly warm to about 15–22 °C (59–72 °F), while autumn sees cooling back to the 8–14 °C (46–57 °F) range. Deeper water remains colder year-round and sudden changes in air temperature or rainfall can shift surface readings quickly, so these figures are general rather than exact.
Open-water swimming is not permitted at Queen Mary Reservoir: it is a working drinking-water reservoir and access is restricted for safety, water-quality protection and operational reasons. Recreational activity is focused on managed uses such as sailing and shore-based birdwatching, and the perimeter paths are popular with walkers and cyclists. The site lies close to Walton-on-Thames and is within easy reach of attractions including Hampton Court Palace and the historic Runnymede meadows, making it a useful base for riverside walks and regional sightseeing even if swimming isn’t allowed.