Lake Derwent Water — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lake Derwent Water, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lake Derwent Water today is 18.1°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 65°F (18°C) to 68°F (20°C). This is already quite warm water, which is ideal for most people. Swimming becomes comfortable, and prolonged stays in the water do not cause discomfort. This temperature is perfect for family trips and for those who prefer warmer water. It is also comfortable for water sports such as surfing or swimming. 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 | 18.6°C | 22.0°C | |
| AUG 7 | 18.6°C | 22.0°C | |
| AUG 8 | 18.6°C | 22.0°C | |
| AUG 9 | 18.6°C | 22.0°C | |
| AUG 10 | 18.1°C | 22.0°C | |
| AUG 11 | 18.1°C | 22.0°C | |
| AUG 12 | 18.1°C | 22.0°C | |
| AUG 13 | 18.1°C | 22.0°C | |
| AUG 14 | 22.0°C | 18.3°C | |
| AUG 15 | 22.0°C | 18.5°C | |
| AUG 16 | 22.0°C | 18.7°C | |
| AUG 17 | 22.0°C | 18.9°C | |
| AUG 18 | 22.0°C | 19.1°C | |
| AUG 19 | 22.0°C | 19.3°C | |
| AUG 20 | 22.0°C | 19.5°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 | 10°C | 15°C | 21°C |
| June | 13°C | 20°C | 26°C |
| July | 16°C | 22°C | 27°C |
| August | 17°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 |
Lake Derwent Water: Water Temperature by Location
Lake Derwent Water: Weather Forecast
August 14
August 15
August 16
August 17
August 18
August 19
Location & Local Information
#Cumbria
Derwent Water’s surface temperature varies noticeably through the year. In winter it typically sits around 2–6 °C (36–43 °F), spring temperatures rise to roughly 4–12 °C (39–54 °F), summer highs commonly reach 12–18 °C (54–64 °F), and autumn cools back to about 6–12 °C (43–54 °F). These figures are approximate and can change with weather, depth and local inflows, so experienced swimmers often check recent local reports before entering the water.
Swimming in Derwent Water is permitted and popular among open-water enthusiasts, but the lake is largely unmanaged — there are few lifeguarded areas and boat traffic, cold water shock and submerged hazards are real risks. Many people use wetsuits and swim with a buddy or under organised groups to reduce risk. Beyond swimming, the area offers plenty to do: the market town of Keswick, scenic walks such as Catbells and the Borrowdale valley, boat cruises across the lake, and historic sites like nearby stone circles, all making Derwent Water a year-round outdoor destination.