Greystones — Water Temperature, Sea Conditions & Trends

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

Water temperature in Greystones rose over the last 30 days but fell over the last week. Currently, the sea water at this location is slightly warmer than average for this day in previous years.

According to our forecast, Water temperature in Greystones will be 15.9°C in the next 7 days. See the table below for daily data for the upcoming week.

Table of Daily Sea Temperature Data

Annual Water Temperature Overview by Month

Monthly Water Temp Ranges

30°C

25°C

20°C

15°C

10°c

5°C

0°C

Annual Water Temperature Trend

Greystones, on the east coast of County Wicklow in Leinster, sits beside the Irish Sea and experiences relatively cool coastal water year-round. Seasonal sea surface temperatures typically range from about 8–10 °C in winter (December–February), rising slowly through spring to roughly 9–13 °C (March–May). The warmest months are June to August when waters generally reach 14–18 °C, with occasional brief peaks closer to 19–20 °C during particularly warm summers. Autumn temperatures commonly sit around 11–15 °C (September–November) as the sea gradually cools. These conditions mean the sea remains distinctly cooler than many continental bathing areas, with the coldest months feeling bracing and the height of summer offering the most comfortable swimming conditions for those accustomed to temperate waters.