Lisburn — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Lisburn, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Lisburn today is 18.3°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 | 19.9°C | 18.0°C | |
| JUL 17 | 19.9°C | 18.0°C | |
| JUL 18 | 19.9°C | 18.0°C | |
| JUL 19 | 19.9°C | 18.0°C | |
| JUL 20 | 19.9°C | 18.0°C | |
| JUL 21 | 18.7°C | 18.0°C | |
| JUL 22 | 18.7°C | 18.0°C | |
| JUL 23 | 18.3°C | 18.0°C | |
| JUL 24 | 18.0°C | 18.3°C | |
| JUL 25 | 18.0°C | 18.3°C | |
| JUL 26 | 18.0°C | 18.3°C | |
| JUL 27 | 18.0°C | 18.2°C | |
| JUL 28 | 18.0°C | 18.2°C | |
| JUL 29 | 18.0°C | 18.2°C | |
| JUL 30 | 18.0°C | 18.2°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 | 12°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 |
Lisburn: Weather Forecast
July 24
July 25
July 26
July 27
Location & Local Information
Lisburn, a historic city in Northern Ireland, lies along the River Lagan, where the water flows gently through green valleys before continuing toward Belfast. The Lagan’s temperature here reflects the region’s cool maritime climate, with steady changes across the seasons. In winter, the river typically remains between 4 and 6°C (39–43°F), staying cold and fresh from upland rainfall. By spring, it warms to around 8–10°C (46–50°F). During midsummer—particularly in July and August—the water can reach 15–17°C (59–63°F) in calm, shallow sections, offering comfortable conditions for recreation. As autumn approaches, the temperature cools again to about 9–11°C (48–52°F), maintaining a mild, refreshing feel through much of the year.
Swimming in the River Lagan near Lisburn is possible and sometimes enjoyed by wild swimmers in rural stretches outside the town. The current is generally moderate, and the water quality is good, though care should be taken after heavy rain when flow rates increase. For most visitors, the Lagan is best experienced from its scenic towpath, which offers walking and cycling routes surrounded by woodland and meadows. The area’s attractions include Wallace Park, the historic linen industry heritage sites, and easy access to the Lagan Valley Regional Park, a peaceful green corridor linking Lisburn and Belfast.