Lough Arrow — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lough Arrow, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lough Arrow today is 18.6°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 | 18.2°C | 22.0°C | |
| AUG 8 | 18.2°C | 22.0°C | |
| AUG 9 | 18.2°C | 22.0°C | |
| AUG 10 | 18.3°C | 22.0°C | |
| AUG 11 | 18.2°C | 22.0°C | |
| AUG 12 | 18.3°C | 22.0°C | |
| AUG 13 | 18.6°C | 22.0°C | |
| AUG 14 | 22.0°C | 18.8°C | |
| AUG 15 | 22.0°C | 18.9°C | |
| AUG 16 | 22.0°C | 19.1°C | |
| AUG 17 | 22.0°C | 19.3°C | |
| AUG 18 | 22.0°C | 19.5°C | |
| AUG 19 | 22.0°C | 19.6°C | |
| AUG 20 | 22.0°C | 19.8°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 | 9°C |
| March | 3°C | 7°C | 10°C |
| April | 6°C | 10°C | 13°C |
| May | 10°C | 15°C | 21°C |
| June | 14°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 | 4°C | 3°C | 9°C |
Lough Arrow: Water Temperature by Location
Lough Arrow: Weather Forecast
August 14
August 15
August 16
August 17
Location & Local Information
Lough Arrow, located between Counties Sligo and Roscommon in western Ireland, is a peaceful freshwater lake surrounded by low hills and rural countryside. Its water temperature varies with the mild Atlantic climate, averaging around 4–6°C (39–43°F) in winter and reaching 15–18°C (59–64°F) in summer. On especially warm days, sheltered areas along the shore may rise to about 19°C (66°F), though deeper parts remain noticeably cooler. The lake’s open surface and relatively high elevation mean it rarely gets truly warm, so the most pleasant swimming conditions occur between late May and early September when the air is also mild.
Swimming is permitted in Lough Arrow, and the lake is known for its clean, clear water, though swimmers should take care to avoid sudden depth changes and strong breezes that can cause waves. Locals often enjoy short swims or use wetsuits for longer sessions. The lake’s calm beauty makes it a favourite for fishing, kayaking, and birdwatching. Nearby, visitors can explore the ancient Carrowkeel tombs on the hills overlooking the lake or enjoy the cultural life of Sligo town about half an hour away. Altogether, Lough Arrow offers a mix of natural tranquillity, refreshing waters, and quiet outdoor recreation in Ireland’s northwest.