High Maynard Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in High Maynard Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in High Maynard Reservoir today is 18.3°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 |
|---|---|---|---|
| SEP 16 | 19.5°C | 21.0°C | |
| SEP 17 | 19.6°C | 21.0°C | |
| SEP 18 | 19.1°C | 21.0°C | |
| SEP 19 | 18.9°C | 21.0°C | |
| SEP 20 | 18.2°C | 21.0°C | |
| SEP 21 | 18.6°C | 21.0°C | |
| SEP 22 | 17.9°C | 21.0°C | |
| SEP 24 | 21.0°C | 18.4°C | |
| SEP 25 | 21.0°C | 18.6°C | |
| SEP 26 | 21.0°C | 18.7°C | |
| SEP 27 | 21.0°C | 18.8°C | |
| SEP 28 | 21.0°C | 19.0°C | |
| SEP 29 | 21.0°C | 19.1°C | |
| SEP 30 | 21.0°C | 19.2°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 | 4°C | 9°C | 13°C |
| December | 4°C | 8°C | 11°C |
High Maynard Reservoir: Water Temperature by Location
High Maynard Reservoir: Weather Forecast
September 23
September 24
September 25
September 26
September 27
Location & Local Information
#Greater London
High Maynard Reservoir in Greater London typically follows the seasonal pattern of other urban reservoirs. In spring surface temperatures commonly sit around 8–14°C (46–57°F) as the water slowly warms, while summer can see 16–22°C (61–72°F) in most years and occasionally up to 24°C (75°F) during heatwaves. Autumn temperatures usually drop back to roughly 10–15°C (50–59°F) and winter surface values are often in the 4–8°C (39–46°F) range. Deeper water stays colder and responds more slowly to air temperature, so these are general surface-water figures rather than precise, site-specific measurements.
Swimming in High Maynard Reservoir is generally not permitted; like many reservoirs around London it is managed for water supply and wildlife, and by-laws, water quality concerns, submerged hazards and the risk of cold-water shock make casual bathing unsafe. Where people do swim in the area it tends to be in designated lakes, lidos or club-organized open-water sessions with safety cover. Visitors to the reservoir commonly enjoy walking, cycling and birdwatching, and there are nearby green spaces and canal paths that provide recreational alternatives.