King George V Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in King George V Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in King George V Reservoir today is 15.6°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 | 17.2°C | 21.9°C | |
| JUN 4 | 17.2°C | 21.9°C | |
| JUN 5 | 17.2°C | 21.9°C | |
| JUN 6 | 17.2°C | 21.9°C | |
| JUN 7 | 17.0°C | 21.9°C | |
| JUN 8 | 15.8°C | 21.9°C | |
| JUN 10 | 15.8°C | 21.9°C | |
| JUN 11 | 21.9°C | 15.9°C | |
| JUN 12 | 21.9°C | 16.2°C | |
| JUN 13 | 21.9°C | 16.5°C | |
| JUN 14 | 21.9°C | 16.9°C | |
| JUN 15 | 21.9°C | 17.2°C | |
| JUN 16 | 21.9°C | 17.5°C | |
| JUN 17 | 21.9°C | 17.8°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 | 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 | 4°C | 9°C | 13°C |
| December | 4°C | 8°C | 11°C |
King George V Reservoir: Water Temperature by Location
King George V Reservoir: Weather Forecast
June 9
June 10
June 11
June 12
June 13
Location & Local Information
#Greater London
King George V Reservoir, part of the Lee Valley chain north of London, is a large, managed drinking-water reservoir whose surface temperatures follow typical seasonal patterns. In winter the water is cold, often around 4–8 °C (39–46 °F), while spring sees a gradual rise to about 6–12 °C (43–54 °F). Summer surface temperatures commonly reach 15–22 °C (59–72 °F) in warm spells, and autumn typically cools back to roughly 10–15 °C (50–59 °F). Deep water and shaded areas remain noticeably colder year-round, and temperatures can change quickly after weather shifts, presenting a risk of cold-water shock.
Open swimming at King George V Reservoir is not permitted because it is a working potable-water storage site managed under strict safety and water-quality rules; byelaws and operational concerns prohibit bathing and unsupervised access. Visitors instead use nearby recreational options within the Lee Valley, including riverside walking and cycling routes, birdwatching at the reservoirs and wetlands, and other leisure facilities such as the Lee Valley White Water Centre and regional parks that offer sanctioned aquatic activities.