Sea Temperature in Castlerock in August

© Mark Gourley

Complete information on the sea temperature range in the Irish Sea in Castlerock in August. Historical daily data. Climate details for August. Tips on swimming conditions and beach relaxation in Castlerock. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Castlerock Climate and Swimming Opportunities in August

Castlerock lies within the Northen Ireland in United Kingdom. The average daytime temperature in Castlerock in August is 18°C (65°F), while the nighttime average is 12°C (53°F). There are typically 16 rainy days during the month, with a total precipitation of 100 mm (3.9 inches). The daylight duration in August in Castlerock is 15 hours, with an average of 4 hours of sunshine per day. The average wind speed in August is 16 km/h (10 mph), and the humidity level is around 88%.

The water temperature in Castlerock in August ranges from 13°C to 14°C (55°F to 57°F). At the beginning of the month, the average temperature is around 14°C (57°F), shifting to 14°C (57°F) by mid-August and reaching 14°C (57°F) in the last ten days. Overall, the average sea temperature in Castlerock for August is 14°C (57°F). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Frequently Asked Questions About Water Temperatures in August in Castlerock