London — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in London, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in London today is 21.6°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 |
|---|---|---|---|
| AUG 6 | 21.7°C | 19.0°C | |
| AUG 7 | 21.7°C | 19.0°C | |
| AUG 8 | 21.7°C | 19.0°C | |
| AUG 9 | 21.7°C | 19.0°C | |
| AUG 10 | 21.6°C | 19.0°C | |
| AUG 11 | 21.6°C | 19.0°C | |
| AUG 12 | 21.6°C | 19.0°C | |
| AUG 13 | 21.6°C | 19.0°C | |
| AUG 14 | 19.0°C | 21.5°C | |
| AUG 15 | 19.0°C | 21.3°C | |
| AUG 16 | 19.0°C | 21.2°C | |
| AUG 17 | 19.0°C | 21.1°C | |
| AUG 18 | 19.0°C | 21.0°C | |
| AUG 19 | 19.0°C | 20.8°C | |
| AUG 20 | 19.0°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 | 19°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 | 4°C | 8°C | 12°C |
| December | 3°C | 7°C | 9°C |
London: Weather Forecast
August 14
August 15
August 16
August 17
August 18
August 19
Location & Local Information
The River Thames in London, particularly the central tidal section, experiences a significant seasonal variation in water temperature. In the coldest months of winter, the temperature generally drops to approximately 6 to 10∘C (43 to 50∘F), while during the summer, it warms up to a peak of around 18 to 22∘C (64 to 72∘F), a range similar to many coastal areas. Even in summer, the deep water and rapid flow maintain a consistent chill.
Swimming in the tidal Thames through central London is strictly prohibited by the Port of London Authority due to significant dangers. These hazards include extremely strong, fast-flowing tides, the risk of cold water shock even in warmer weather, heavy commercial and recreational boat traffic, and the presence of sewage overflow after heavy rainfall. However, upstream of Putney Bridge, swimming is technically permitted outside of the main navigation channel, but still discouraged due to the risks. Visitors can enjoy countless other riverside attractions, such as the Tower of London, the London Eye, and the Tate Modern art gallery.