Simpson Ground Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Simpson Ground Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Simpson Ground Reservoir today is 15.7°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 |
|---|---|---|---|
| AUG 26 | 16.8°C | 21.5°C | |
| AUG 27 | 16.8°C | 21.5°C | |
| AUG 28 | 16.8°C | 21.5°C | |
| AUG 29 | 16.8°C | 21.5°C | |
| AUG 30 | 16.9°C | 21.5°C | |
| AUG 31 | 17.0°C | 21.5°C | |
| SEP 1 | 15.9°C | 19.0°C | |
| SEP 2 | 16.5°C | 19.0°C | |
| SEP 3 | 19.0°C | 15.9°C | |
| SEP 4 | 19.0°C | 16.0°C | |
| SEP 5 | 19.0°C | 16.2°C | |
| SEP 6 | 19.0°C | 16.4°C | |
| SEP 7 | 19.0°C | 16.5°C | |
| SEP 8 | 19.0°C | 16.7°C | |
| SEP 9 | 19.0°C | 16.9°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 | 1°C | 5°C | 8°C |
| February | 1°C | 5°C | 8°C |
| March | 3°C | 7°C | 10°C |
| April | 6°C | 10°C | 13°C |
| May | 9°C | 15°C | 21°C |
| June | 13°C | 20°C | 26°C |
| July | 16°C | 22°C | 27°C |
| August | 15°C | 22°C | 27°C |
| September | 13°C | 19°C | 24°C |
| October | 9°C | 13°C | 17°C |
| November | 5°C | 9°C | 12°C |
| December | 0°C | 4°C | 8°C |
Simpson Ground Reservoir: Water Temperature by Location
Simpson Ground Reservoir: Weather Forecast
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September 8
Location & Local Information
#Cumbria
Simpson Ground Reservoir sits in the Central Lake District and, being an upland impoundment, its water stays cool year‑round. Typical surface temperatures in summer range from about 10–16 °C (50–61 °F), while spring and autumn are usually around 6–12 °C (43–54 °F). In winter the water commonly falls to roughly 4–7 °C (39–45 °F), although local weather and depth will affect exact figures. Because temperatures are low even in summer, prolonged immersion carries a real risk of cold‑water shock and rapid loss of body heat.
Swimming at Simpson Ground is not actively promoted by landowners and is generally considered unofficial. As a working reservoir it has infrastructure, intake zones and water quality considerations, and many such sites discourage bathing for safety and supply reasons. Some experienced wild swimmers do enter upland reservoirs, but anyone considering it should heed local signage, check with the landowner or water authority, and be aware of hidden hazards. The area is popular for walking and sightseeing, with nearby Grasmere, Rydal Water and Loughrigg Fell offering alternative outdoor activities if you prefer not to swim.