Coleraine — Current Water Temperature, Annual Trends and Forecast
This page provides information on the current water temperature in Coleraine, trends, monthly ranges and the forecast for the coming days.
Current Water Temperature
Water Temperature in Coleraine today is 13.7°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
⚠️ As of today, the minimum water temperature ranges from 54°F (12°C) to 60°F (15°C). The water is significantly warmer, and swimming becomes possible for most people. However, caution may still be required for prolonged stays in the water, as extended exposure can cause discomfort. This is a suitable temperature range for short swims and for those accustomed to cooler water. For more comfortable swimming, it is recommended to use proper gear. 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 |
|---|---|---|---|
| SEP 16 | 14.4°C | 14.0°C | |
| SEP 17 | 14.3°C | 14.0°C | |
| SEP 18 | 14.2°C | 14.0°C | |
| SEP 19 | 14.3°C | 14.0°C | |
| SEP 20 | 13.9°C | 14.0°C | |
| SEP 21 | 13.8°C | 14.0°C | |
| SEP 22 | 12.7°C | 14.0°C | |
| SEP 23 | 13.7°C | 14.0°C | |
| SEP 24 | 14.0°C | 13.7°C | |
| SEP 25 | 14.0°C | 13.7°C | |
| SEP 26 | 14.0°C | 13.7°C | |
| SEP 27 | 14.0°C | 13.8°C | |
| SEP 28 | 14.0°C | 13.8°C | |
| SEP 29 | 14.0°C | 13.8°C | |
| SEP 30 | 14.0°C | 13.8°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 | 0°C | 3°C | 6°C |
| February | 0°C | 3°C | 7°C |
| March | 1°C | 5°C | 8°C |
| April | 4°C | 7°C | 11°C |
| May | 8°C | 12°C | 17°C |
| June | 11°C | 17°C | 21°C |
| July | 12°C | 17°C | 21°C |
| August | 12°C | 17°C | 21°C |
| September | 9°C | 14°C | 18°C |
| October | 6°C | 9°C | 12°C |
| November | 4°C | 8°C | 11°C |
| December | 0°C | 4°C | 8°C |
Coleraine: Weather Forecast
September 23
September 24
September 25
September 26
September 27
Location & Local Information
Coleraine, a historic town in Northern Ireland, rests where the River Bann flows into the Atlantic, giving the water here a distinctive mix of river and tidal influence. Because of the maritime setting and northern latitude, the water remains cool throughout the year. In winter, the river near Coleraine typically lingers around 4–6 °C (39–43 °F), keeping it brisk and chilly. As spring arrives, it gradually uplifts to roughly 8–11 °C (46–52 °F). During the peak of summer—July and August—surface temperatures may climb to about 15–17 °C (59–63 °F) in sunlit, sheltered sections, though most areas stay cooler. In early autumn it usually returns to around 10–12 °C (50–54 °F), maintaining a sharp freshness well into the later months.
Swimming in the River Bann at Coleraine is technically allowed, but conditions mean it is best suited to confident wild swimmers. The tide, current, and river depth can change quickly, and entry points are less obvious than in managed swimming venues. For casual visitors, the riverside is more commonly enjoyed via walks, fishing spots, or boat trips. Nearby attractions enrich the experience of being by the water — the riverside paths and the landmark Bann Bridge provide pleasant views, while the broader Causeway Coast offers dramatic scenery, historic sites and coastal beaches within easy reach.