Grimwith Reservoir — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Grimwith Reservoir, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Grimwith Reservoir today is 17.7°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 |
|---|---|---|---|
| JUL 16 | 18.5°C | 20.6°C | |
| JUL 17 | 18.0°C | 20.6°C | |
| JUL 18 | 18.0°C | 20.6°C | |
| JUL 19 | 18.0°C | 20.6°C | |
| JUL 20 | 18.0°C | 20.6°C | |
| JUL 21 | 17.7°C | 20.6°C | |
| JUL 22 | 17.7°C | 20.6°C | |
| JUL 23 | 17.7°C | 20.6°C | |
| JUL 24 | 20.6°C | 17.8°C | |
| JUL 25 | 20.6°C | 18.0°C | |
| JUL 26 | 20.6°C | 18.1°C | |
| JUL 27 | 20.6°C | 18.3°C | |
| JUL 28 | 20.6°C | 18.4°C | |
| JUL 29 | 20.6°C | 18.6°C | |
| JUL 30 | 20.6°C | 18.7°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 | 0°C | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 2°C | 6°C | 9°C |
| April | 5°C | 9°C | 12°C |
| May | 9°C | 14°C | 20°C |
| June | 11°C | 18°C | 25°C |
| July | 15°C | 21°C | 26°C |
| August | 16°C | 21°C | 26°C |
| September | 12°C | 18°C | 23°C |
| October | 8°C | 12°C | 15°C |
| November | 3°C | 7°C | 11°C |
| December | 0°C | 3°C | 7°C |
Grimwith Reservoir: Water Temperature by Location
Grimwith Reservoir: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
#North Yorkshire
Grimwith Reservoir, high in Nidderdale, typically stays cool year-round. Winter surface temperatures commonly sit around 0–4 °C (32–39 °F), spring rises to roughly 4–10 °C (39–50 °F), summer surface temperatures usually reach about 10–16 °C (50–61 °F), and autumn falls back to near 6–11 °C (43–52 °F). These figures vary with depth, weather and recent rainfall; deeper water and cloudy conditions will be colder. Cold water shock is a real risk even in summer when temperatures are below what many swimmers expect.
Swimming in Grimwith is generally discouraged by the reservoir owner because of safety issues and potential impacts on the public water supply — hidden currents, submerged structures and intake workings make unsupervised bathing hazardous. Organized water-sport activities such as sailing and licensed angling take place under controlled conditions, and some experienced wild swimmers do visit at their own risk. The area nevertheless attracts walkers and birdwatchers, with waymarked trails, views across Nidderdale AONB and the nearby town of Pateley Bridge offering local amenities and additional countryside access.