River Erne — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the River Erne, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the River Erne today is 18.8°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 | 19.8°C | 18.0°C | |
| JUL 17 | 19.9°C | 18.0°C | |
| JUL 18 | 20.2°C | 18.0°C | |
| JUL 19 | 19.7°C | 18.0°C | |
| JUL 20 | 19.8°C | 18.0°C | |
| JUL 21 | 19.3°C | 18.0°C | |
| JUL 22 | 19.1°C | 18.0°C | |
| JUL 23 | 18.8°C | 18.0°C | |
| JUL 24 | 18.0°C | 18.8°C | |
| JUL 25 | 18.0°C | 18.7°C | |
| JUL 26 | 18.0°C | 18.7°C | |
| JUL 27 | 18.0°C | 18.6°C | |
| JUL 28 | 18.0°C | 18.6°C | |
| JUL 29 | 18.0°C | 18.6°C | |
| JUL 30 | 18.0°C | 18.5°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 | 0°C | 4°C | 7°C |
| February | 0°C | 4°C | 7°C |
| March | 2°C | 6°C | 9°C |
| April | 5°C | 8°C | 12°C |
| May | 9°C | 13°C | 18°C |
| June | 13°C | 18°C | 22°C |
| July | 14°C | 18°C | 23°C |
| August | 14°C | 18°C | 23°C |
| September | 11°C | 16°C | 20°C |
| October | 8°C | 11°C | 14°C |
| November | 4°C | 7°C | 10°C |
| December | 0°C | 4°C | 8°C |
River Erne: Water Temperature by Location
River Erne: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Source:
• location Slieve Glah, County Cavan, Ireland
• elevation ~255 m (837 ft)
Mouth:
• location Donegal Bay at Ballyshannon, County Donegal
• coordinates
Length ~129 km (80 mi)
The River Erne flows through both Northern Ireland and the Republic of Ireland, rising in County Cavan and winding through the lakelands of County Fermanagh before reaching the sea at Donegal Bay. Its temperature varies with the seasons and location, influenced by the many lakes along its course. In winter, the water typically stays between 4–6°C (39–43°F), while in summer it warms to around 15–18°C (59–64°F). During calm, sunny weather in July or August, shallow stretches and sheltered bays—particularly around Upper and Lower Lough Erne—may briefly reach 19°C (66°F). The combination of freshwater inflows and mild Atlantic air keeps the Erne system cool and clear, offering refreshing conditions for swimmers during the warmer months.
Swimming in the River Erne is allowed in several areas, though it is safest where currents are gentle and access is easy, such as along the shores of Lough Erne near Enniskillen. The water quality is generally good, but as the river connects many lakes and channels, local knowledge and care are important. Wetsuits are common outside midsummer, as deeper waters stay cool year-round. The river and its lakes also provide excellent opportunities for boating, kayaking, and fishing. Nearby attractions include Enniskillen Castle, Devenish Island, and the scenic waterways of the Fermanagh Lakelands, known for their quiet natural beauty.