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 22.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
✅ As of today, the minimum water temperature ranges from 68°F (20°C) to 74°F (23°C). The water is warm and pleasant for swimming, and in this range, one can stay in the water for extended periods without the risk of hypothermia. This is the ideal temperature for relaxation, swimming, and water sports. Families with children, as well as outdoor enthusiasts, will enjoy swimming and time spent in the water. For most people, this is the optimal temperature for a comfortable beach experience. 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 5 | 24.3°C | 23.0°C | |
| AUG 6 | 22.8°C | 23.0°C | |
| AUG 7 | 22.6°C | 23.0°C | |
| AUG 8 | 22.6°C | 23.0°C | |
| AUG 9 | 22.8°C | 23.0°C | |
| AUG 10 | 22.7°C | 23.0°C | |
| AUG 11 | 22.7°C | 23.0°C | |
| AUG 12 | 22.7°C | 23.0°C | |
| AUG 13 | 23.0°C | 22.7°C | |
| AUG 14 | 23.0°C | 22.7°C | |
| AUG 15 | 23.0°C | 22.7°C | |
| AUG 16 | 23.0°C | 22.8°C | |
| AUG 17 | 23.0°C | 22.8°C | |
| AUG 18 | 23.0°C | 22.8°C | |
| AUG 19 | 23.0°C | 22.8°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 | 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 Mary Reservoir: Water Temperature by Location
Queen Mary Reservoir: Weather Forecast
August 13
August 14
August 15
August 16
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.