Brent Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Brent Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Brent 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 | 20.2°C | 23.0°C | |
| AUG 30 | 19.7°C | 23.0°C | |
| AUG 31 | 19.8°C | 23.0°C | |
| SEP 1 | 19.5°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 | 4°C | 9°C | 13°C |
| December | 4°C | 8°C | 11°C |
Brent Reservoir: Water Temperature by Location
Brent Reservoir: Weather Forecast
September 3
September 4
September 5
September 6
September 7
Location & Local Information
#Greater London
Brent Reservoir, often called the Welsh Harp, sits on the edge of northwest London and has a fairly typical temperate-reservoir temperature profile. Surface water in winter usually falls to around 4–8 °C (39–46 °F), rising in spring to roughly 6–12 °C (43–54 °F). In summer the reservoir can reach about 15–22 °C (59–72 °F) on warm days, while autumn sees temperatures drop back to roughly 10–15 °C (50–59 °F). Despite these milder summer readings, swimming is generally not permitted. The restriction reflects safety concerns — variable depths, submerged hazards and boat traffic — alongside variable water quality and local management rules that prioritize boating, fishing and wildlife conservation over open bathing.
For visitors seeking alternatives, the area around the reservoir offers plenty of outdoor interest. The shoreline and adjacent green spaces provide good walking routes, birdwatching opportunities within the nature reserve, and active sailing and angling communities. Local parks, trails of the Brent River corridor and nearby leisure centres or lidos offer safer, permitted options for swimming if you want to cool off under supervision.