Sunbury-on-Thames — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Sunbury-on-Thames, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Sunbury-on-Thames today is 21°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 |
|---|---|---|---|
| JUL 15 | 23.8°C | 20.0°C | |
| JUL 16 | 23.8°C | 20.0°C | |
| JUL 17 | 22.1°C | 20.0°C | |
| JUL 18 | 22.0°C | 20.0°C | |
| JUL 19 | 22.0°C | 20.0°C | |
| JUL 20 | 22.0°C | 20.0°C | |
| JUL 21 | 21.0°C | 20.0°C | |
| JUL 22 | 21.0°C | 20.0°C | |
| JUL 23 | 20.0°C | 21.0°C | |
| JUL 24 | 20.0°C | 20.9°C | |
| JUL 25 | 20.0°C | 20.9°C | |
| JUL 26 | 20.0°C | 20.8°C | |
| JUL 27 | 20.0°C | 20.8°C | |
| JUL 28 | 20.0°C | 20.7°C | |
| JUL 29 | 20.0°C | 20.7°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 | 2°C | 6°C | 9°C |
| February | 3°C | 7°C | 9°C |
| March | 5°C | 9°C | 11°C |
| April | 8°C | 11°C | 14°C |
| May | 9°C | 14°C | 18°C |
| June | 13°C | 19°C | 24°C |
| July | 16°C | 20°C | 25°C |
| August | 15°C | 19°C | 24°C |
| September | 13°C | 18°C | 22°C |
| October | 9°C | 13°C | 16°C |
| November | 5°C | 8°C | 11°C |
| December | 3°C | 7°C | 9°C |
Sunbury-on-Thames: Weather Forecast
July 23
July 24
July 25
July 26
July 27
Location & Local Information
Sunbury-on-Thames, a riverside town in Surrey, lies along a calm and picturesque section of the River Thames just west of London. The water here reflects the mild southern English climate, with temperature changes following the rhythm of the seasons. In winter, the Thames at Sunbury usually measures around 5–7°C (41–45°F), remaining cold and fast-moving after rainfall. During spring, it gradually warms to 10–13°C (50–55°F), while in summer, particularly in July and August, the temperature often reaches 18–21°C (64–70°F). Early autumn maintains a gentle warmth of about 14–16°C (57–61°F) before the water cools again as the days shorten. The flow is steady but not strong, and the river’s wide bends create many peaceful stretches of water.
Swimming in the Thames at Sunbury-on-Thames is possible, though it is best suited for experienced open-water swimmers who are familiar with local conditions. The river here is relatively clean, but care is needed because of passing boats and uneven depths. In summer, calm mornings often attract swimmers seeking a quiet dip in nature, while others prefer paddleboarding or kayaking along the scenic banks. The town itself offers riverside pubs, walking paths, and easy access to nearby attractions such as Hampton Court Palace and Bushy Park.