River Boyne — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in the River Boyne, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in the River Boyne today is 16.5°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 60°F (15°C) to 65°F (18°C). The water is comfortable for most people, making it an ideal range for water sports enthusiasts. The temperature does not cause significant discomfort, and swimming will be pleasant for the majority. However, it's important to remember that prolonged exposure to the water can still lead to cooling, so it's essential to monitor the time spent in the water, especially for children or elderly people. 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 | 16.7°C | 18.0°C | |
| AUG 7 | 16.6°C | 18.0°C | |
| AUG 8 | 16.2°C | 18.0°C | |
| AUG 9 | 16.3°C | 18.0°C | |
| AUG 10 | 16.6°C | 18.0°C | |
| AUG 11 | 16.6°C | 18.0°C | |
| AUG 12 | 16.4°C | 18.0°C | |
| AUG 13 | 16.5°C | 18.0°C | |
| AUG 14 | 18.0°C | 16.6°C | |
| AUG 15 | 18.0°C | 16.7°C | |
| AUG 16 | 18.0°C | 16.7°C | |
| AUG 17 | 18.0°C | 16.8°C | |
| AUG 18 | 18.0°C | 16.9°C | |
| AUG 19 | 18.0°C | 17.0°C | |
| AUG 20 | 18.0°C | 17.0°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 | 8°C |
| March | 2°C | 6°C | 9°C |
| April | 6°C | 9°C | 12°C |
| May | 9°C | 14°C | 18°C |
| June | 12°C | 18°C | 23°C |
| July | 15°C | 20°C | 24°C |
| August | 14°C | 18°C | 23°C |
| September | 11°C | 16°C | 20°C |
| October | 9°C | 12°C | 15°C |
| November | 4°C | 7°C | 11°C |
| December | 4°C | 4°C | 9°C |
River Boyne: Water Temperature by Location
River Boyne: Weather Forecast
August 14
August 15
August 16
August 17
Location & Local Information
Source Trinity Well, Newberry Hall, near Carbury
• location County Kildare
Mouth Irish Sea
• location Between Mornington, County Meath, and Baltray, County Louth
• coordinates 53.72173°N 6.23813°W
Length 112 km (70 mi)
The River Boyne flows through Counties Kildare, Meath, and Louth in eastern Ireland before reaching the Irish Sea at Drogheda. Its water temperature changes moderately with the seasons, influenced by its inland flow and the temperate maritime climate. In winter, temperatures usually range between 4–6°C (39–43°F), while in summer they rise to about 15–18°C (59–64°F). On warm, calm days in July or August, shallow stretches may briefly reach 19°C (66°F), but deeper sections and shaded bends stay cooler. The river’s clean, slow-moving waters make it most comfortable for swimming from late May to early September, when air temperatures are mild and daylight is longest.
Swimming in the River Boyne is allowed, and certain stretches near Trim, Slane, and Drogheda are popular for open-water swimming and short recreational dips. However, swimmers should take care around weirs, bridges, and fast-flowing areas, especially after rainfall. The water is generally of good quality, and local swimming groups often organize safe, supervised events during the summer. Beyond swimming, the Boyne Valley is rich in history and natural beauty. Nearby attractions include the ancient monuments of Newgrange, Knowth, and Dowth, as well as Slane Castle and the scenic Boyne Greenway, offering visitors a mix of culture, heritage, and outdoor enjoyment.