King George VI Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in King George VI Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in King George VI Reservoir today is 20°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 20.3°C | 23.0°C | |
| AUG 27 | 20.3°C | 23.0°C | |
| AUG 28 | 20.3°C | 23.0°C | |
| AUG 29 | 20.3°C | 23.0°C | |
| AUG 30 | 19.8°C | 23.0°C | |
| AUG 31 | 19.9°C | 23.0°C | |
| SEP 1 | 19.6°C | 21.0°C | |
| SEP 2 | 20.0°C | 21.0°C | |
| SEP 3 | 21.0°C | 20.1°C | |
| SEP 4 | 21.0°C | 20.1°C | |
| SEP 5 | 21.0°C | 20.2°C | |
| SEP 6 | 21.0°C | 20.2°C | |
| SEP 7 | 21.0°C | 20.3°C | |
| SEP 8 | 21.0°C | 20.3°C | |
| SEP 9 | 21.0°C | 20.4°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 | 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 |
King George VI Reservoir: Water Temperature by Location
King George VI Reservoir: Weather Forecast
September 3
September 4
September 5
September 6
September 7
Location & Local Information
#Surrey
King George VI Reservoir, a large drinking-water reservoir in Surrey, tends to remain cool through the year because of its depth and open exposure. Typical surface temperatures in winter sit around 4–8 °C (39–46 °F), rising through spring to roughly 6–14 °C (43–57 °F). In summer the surface can reach about 18–22 °C (64–72 °F) on warm days but often stays cooler than shallow lakes; temperatures begin to fall again in autumn toward the single digits to low teens Celsius (mid‑40s to mid‑50s °F).
Open swimming in the reservoir is not generally permitted: it is managed for public water supply and authorities restrict bathing for safety, water quality and operational reasons. Unauthorized swimming is discouraged and can be hazardous because of cold water, currents and unseen infrastructure. The area around the reservoir, however, offers other attractions, including riverside and woodland walks, birdwatching opportunities, and nearby sites such as Runnymede and Windsor Great Park; organized watersports and clubs on permitted stretches of water can provide safer alternatives for those seeking on‑water recreation.