Strangford Lough — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Strangford Lough, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Strangford Lough today is 18.2°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 | 18.8°C | 22.0°C | |
| AUG 7 | 18.8°C | 22.0°C | |
| AUG 8 | 18.2°C | 22.0°C | |
| AUG 9 | 18.2°C | 22.0°C | |
| AUG 10 | 18.5°C | 22.0°C | |
| AUG 11 | 18.4°C | 22.0°C | |
| AUG 12 | 18.1°C | 22.0°C | |
| AUG 13 | 18.2°C | 22.0°C | |
| AUG 14 | 22.0°C | 18.4°C | |
| AUG 15 | 22.0°C | 18.6°C | |
| AUG 16 | 22.0°C | 18.8°C | |
| AUG 17 | 22.0°C | 19.0°C | |
| AUG 18 | 22.0°C | 19.2°C | |
| AUG 19 | 22.0°C | 19.3°C | |
| AUG 20 | 22.0°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 | 9°C |
| March | 3°C | 7°C | 10°C |
| April | 6°C | 10°C | 13°C |
| May | 10°C | 15°C | 21°C |
| June | 13°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 | 3°C | 6°C | 9°C |
Strangford Lough: Water Temperature by Location
Strangford Lough: Weather Forecast
August 14
August 15
August 16
August 17
August 18
August 19
Location & Local Information
Strangford Lough, located on the eastern coast of County Down, is a large tidal inlet connected to the Irish Sea and known for its mix of saltwater and freshwater influences. The lough’s water temperature varies with the seasons and tides, typically staying cooler than inland lakes. In winter, temperatures usually range from 6–8 °C (43–46 °F), rising slowly through spring to about 10–12 °C (50–54 °F). During summer, surface waters can warm to around 15–18 °C (59–64 °F), especially in sheltered bays, while autumn sees a gradual decline back toward 10 °C (50 °F). The tidal exchange helps maintain good water quality, though the currents can be strong near the narrows.
Swimming in Strangford Lough is generally allowed and enjoyed in calmer areas, particularly around sandy coves and small beaches such as those near Whiterock, Killyleagh, and Ballydorn. The open-water swimming community often uses the lough during summer, but swimmers must pay attention to tides and local advice due to fast-moving channels. Wetsuits are recommended outside the warmest months. Beyond swimming, the area is famous for kayaking, sailing, and wildlife watching, with seals and seabirds commonly seen. Nearby attractions include the charming village of Strangford, Mount Stewart House and Gardens, and the scenic coastal drive toward Portaferry.