Lough Derravaragh — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lough Derravaragh, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lough Derravaragh today is 19.4°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 |
|---|---|---|---|
| JUL 16 | 20.6°C | 22.5°C | |
| JUL 17 | 20.6°C | 22.5°C | |
| JUL 18 | 20.6°C | 22.5°C | |
| JUL 19 | 20.5°C | 22.5°C | |
| JUL 20 | 20.5°C | 22.5°C | |
| JUL 21 | 19.9°C | 22.5°C | |
| JUL 22 | 19.9°C | 22.5°C | |
| JUL 23 | 19.4°C | 22.5°C | |
| JUL 24 | 22.5°C | 19.6°C | |
| JUL 25 | 22.5°C | 19.7°C | |
| JUL 26 | 22.5°C | 19.9°C | |
| JUL 27 | 22.5°C | 20.0°C | |
| JUL 28 | 22.5°C | 20.2°C | |
| JUL 29 | 22.5°C | 20.3°C | |
| JUL 30 | 22.5°C | 20.5°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 | 2°C | 6°C | 9°C |
| February | 2°C | 6°C | 9°C |
| March | 3°C | 7°C | 10°C |
| April | 7°C | 11°C | 14°C |
| May | 11°C | 17°C | 22°C |
| June | 14°C | 21°C | 27°C |
| July | 17°C | 23°C | 28°C |
| August | 17°C | 22°C | 27°C |
| September | 13°C | 19°C | 24°C |
| October | 10°C | 14°C | 18°C |
| November | 5°C | 9°C | 12°C |
| December | 2°C | 6°C | 9°C |
Lough Derravaragh: Water Temperature by Location
Lough Derravaragh: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Lough Derravaragh, located in County Westmeath in central Ireland, is a long, shallow lake shaped by glacial activity and surrounded by rolling farmland. Its water temperature follows the seasonal rhythm of the Irish Midlands, averaging around 4–6°C (39–43°F) in winter and reaching between 15–18°C (59–64°F) in summer. On particularly warm, calm days, the upper layer can briefly rise to 19°C (66°F), but deeper sections remain noticeably cooler. The lake’s open exposure means breezes can quickly lower surface warmth, so the best time for swimming is from late May to early September, when the water and weather are at their mildest.
Swimming is allowed in Lough Derravaragh, and it is a popular choice for both local swimmers and families on warm days. The shallow areas near Donore and Crookedwood provide easier and safer access, though swimmers should remain cautious of sudden depth changes and weather shifts. Wetsuits are commonly used outside midsummer. The lake is also well known for boating and trout fishing, and it holds a special place in Irish folklore as the legendary setting of the “Children of Lir.” Nearby attractions include the historic town of Mullingar and the scenic Fore Abbey ruins, making the area rich in both nature and heritage.