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 11.9°C.
Water Temperature: Daily Trends, Historical Records, and Forecast
❌ As of today, the minimum water temperature ranges from 50°F (10°C) to 54°F (12°C). The water is slightly warmer, but still cool for most people. Swimming in such conditions is possible, but for most people, the time spent in the water should be limited to avoid hypothermia. Even experienced swimmers may feel discomfort if they stay in the water for too long. To improve comfort and safety, a wetsuit can be used. 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 |
|---|---|---|---|
| OCT 7 | 12.1°C | 9.0°C | |
| OCT 8 | 11.4°C | 9.0°C | |
| OCT 9 | 11.9°C | 9.0°C | |
| OCT 10 | 11.3°C | 9.0°C | |
| OCT 11 | 11.9°C | 9.0°C | |
| OCT 12 | 10.5°C | 9.0°C | |
| OCT 13 | 11.2°C | 9.0°C | |
| OCT 14 | 11.6°C | 9.0°C | |
| OCT 15 | 9.0°C | 11.8°C | |
| OCT 16 | 9.0°C | 11.6°C | |
| OCT 17 | 9.0°C | 11.5°C | |
| OCT 18 | 9.0°C | 11.3°C | |
| OCT 19 | 9.0°C | 11.2°C | |
| OCT 20 | 9.0°C | 11.0°C | |
| OCT 21 | 9.0°C | 10.9°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 | 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
October 15
October 16
October 17
October 18
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.