Weir Wood Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Weir Wood Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Weir Wood Reservoir today is 16.3°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 |
|---|---|---|---|
| SEP 16 | 18.0°C | 21.0°C | |
| SEP 17 | 18.1°C | 21.0°C | |
| SEP 18 | 17.5°C | 21.0°C | |
| SEP 19 | 17.7°C | 21.0°C | |
| SEP 20 | 16.7°C | 21.0°C | |
| SEP 21 | 17.1°C | 21.0°C | |
| SEP 22 | 16.9°C | 21.0°C | |
| SEP 23 | 16.3°C | 21.0°C | |
| SEP 24 | 21.0°C | 16.5°C | |
| SEP 25 | 21.0°C | 16.8°C | |
| SEP 26 | 21.0°C | 17.0°C | |
| SEP 27 | 21.0°C | 17.2°C | |
| SEP 28 | 21.0°C | 17.5°C | |
| SEP 29 | 21.0°C | 17.7°C | |
| SEP 30 | 21.0°C | 17.9°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 | 10°C | 16°C | 22°C |
| June | 14°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 |
Weir Wood Reservoir: Water Temperature by Location
Weir Wood Reservoir: Weather Forecast
September 23
September 24
September 25
September 26
September 27
Location & Local Information
#West Sussex
Weir Wood Reservoir in West Sussex experiences typical southern English reservoir temperatures that vary through the year. In winter the surface temperature often sits around 4–6 °C (39–43 °F), while spring and autumn see a gradual change roughly between 8–14 °C (46–57 °F). In summer the shallows can warm to about 16–22 °C (61–72 °F), though deeper parts stay noticeably cooler. These ranges depend on weather and wind; prolonged warm spells can push the surface toward the upper end of the summer range, while cold snaps lower temperatures quickly.
Swimming is not officially supported at Weir Wood and is generally discouraged for safety, conservation and water-quality reasons — reservoirs can have cold, deep water, hidden currents and infrastructure that present hazards. The site is better known for birdwatching, angling and sailing, and visitors often enjoy surrounding walking trails, picnic spots and the attractive nearby countryside, which includes scenic routes and traditional villages popular with walkers and nature lovers.