Lough O'Flynn — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lough O'Flynn, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lough O'Flynn today is 18.7°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 | 19.5°C | 22.0°C | |
| JUL 17 | 19.7°C | 22.0°C | |
| JUL 18 | 20.1°C | 22.0°C | |
| JUL 19 | 20.0°C | 22.0°C | |
| JUL 20 | 19.6°C | 22.0°C | |
| JUL 21 | 19.0°C | 22.0°C | |
| JUL 22 | 18.8°C | 22.0°C | |
| JUL 23 | 18.7°C | 22.0°C | |
| JUL 24 | 22.0°C | 18.9°C | |
| JUL 25 | 22.0°C | 19.0°C | |
| JUL 26 | 22.0°C | 19.2°C | |
| JUL 27 | 22.0°C | 19.4°C | |
| JUL 28 | 22.0°C | 19.5°C | |
| JUL 29 | 22.0°C | 19.7°C | |
| JUL 30 | 22.0°C | 19.9°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 | 10°C | 16°C | 22°C |
| June | 13°C | 20°C | 27°C |
| July | 15°C | 22°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 O'Flynn: Water Temperature by Location
Lough O'Flynn: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Lough O'Flynn lies in County Roscommon, Ireland, just north of Ballinlough, within a quiet raised-bog and woodland setting. Its modest size and limestone basin lead to a relatively stable but cool water body. While there are no widely published detailed temperature logs for every month, one can reasonably estimate that in the winter months the surface water hovers around 4–6 °C (39–43 °F), given the inland Irish climate and the lake’s elevation. During the summer, the surface warms to about 14–17 °C (57–63 °F), and in sheltered, shallow bays on calm sunny days it might briefly reach 18–19 °C (64–66 °F). Below the surface, the water remains cooler, and the best time for more comfortable swimming would be late June through early September when air and water temperatures align most favourably.
Swimming in Lough O’Flynn is technically possible, though it is not widely promoted as a dedicated bathing location. Because the lake is more known for angling and its natural habitat status, there are limited developed access spots for swimmers. If one chooses to swim, it is wise to pick a safe, shallow shore-entry point, preferably during the warmest months, and be mindful of cooler sub-surface water and limited lifeguard oversight. Nearby, visitors can enjoy the raised-bog loop walk around Carrowbehy/Caher Bog, explore the source of the River Suck, or take the short drive to Ballinlough’s village amenities. Altogether, Lough O’Flynn offers a peaceful, scenic lake experience—with swimming as a less-formal option for the confident and prepared.