Lough Conn — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lough Conn, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lough Conn today is 18.5°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 | 21.0°C | 21.4°C | |
| JUL 17 | 21.2°C | 21.4°C | |
| JUL 18 | 21.6°C | 21.4°C | |
| JUL 19 | 20.2°C | 21.4°C | |
| JUL 20 | 19.3°C | 21.4°C | |
| JUL 21 | 19.0°C | 21.4°C | |
| JUL 22 | 19.0°C | 21.4°C | |
| JUL 23 | 18.5°C | 21.4°C | |
| JUL 24 | 21.4°C | 18.6°C | |
| JUL 25 | 21.4°C | 18.8°C | |
| JUL 26 | 21.4°C | 18.9°C | |
| JUL 27 | 21.4°C | 19.1°C | |
| JUL 28 | 21.4°C | 19.2°C | |
| JUL 29 | 21.4°C | 19.4°C | |
| JUL 30 | 21.4°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 | 10°C |
| March | 3°C | 7°C | 10°C |
| April | 6°C | 10°C | 15°C |
| May | 10°C | 15°C | 21°C |
| June | 13°C | 20°C | 26°C |
| July | 15°C | 21°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 | 4°C | 7°C | 10°C |
Lough Conn: Water Temperature by Location
Lough Conn: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Lough Conn, in County Mayo in western Ireland, is one of the country’s most picturesque freshwater lakes, surrounded by low hills and quiet villages. Its water temperature stays cool for much of the year, typically around 4–6°C (39–43°F) in winter and rising to about 14–17°C (57–63°F) in July and August. During unusually warm spells, shallow areas near the shore may reach 18°C (64°F), but the deeper waters remain brisk. The lake’s clear, open surface and exposure to Atlantic winds mean the water rarely feels warm, so most people choose to swim only during midsummer, when both air and water temperatures are at their mildest.
Swimming is permitted in Lough Conn, but it is generally recommended only for experienced swimmers or those using wetsuits, as the lake can be deep and cold with unpredictable currents. Locals and visitors often enjoy short dips near safe access points around Pontoon or Crossmolina. Beyond swimming, the lake is famous for its trout and salmon fishing, drawing anglers from across Ireland. The area also offers scenic walks, boating, and views of nearby Nephin mountain, making Lough Conn not only a place for cold but invigorating swims, but also a peaceful destination for nature and outdoor recreation.