September is a popular month to ask about Inch Beach because conditions can shift week to week along this coast. Expect the water near 15.0°C, with daily variation from wind, tides and recent storms. We refresh the live value from Open-Meteo Marine every hour, so the headline above always reflects the current state of the Celtic Sea.
Inch Beach sea temperature in September — averages 15.0°C
The sea at Inch Beach in Ireland averages 15.0°C during September, based on long-run climatology for the Celtic Sea. Use the live reading below for today's actual water and the monthly grid to compare with the rest of the year.
Average sea · September
15.0°C
mild · Fair
Live water now
…
Recommended wetsuit
4/3mm fullsuit
At 15.0°C you need a 4/3mm fullsuit, and many surfers add neoprene boots.
Monthly comparison
Cool — short dips or a shorty wetsuit · Inch Beach
Can you swim at Inch Beach in June? — 13.0°C water13.0°CCan you swim at Inch Beach in July? — 15.0°C water15.0°CCan you swim at Inch Beach in August? — 16.0°C water16.0°CCan you swim at Inch Beach in September? — 15.0°C water15.0°CCan you swim at Inch Beach in October? — 14.0°C water14.0°CCan you swim at Inch Beach in November? — 12.0°C water12.0°C
Frequently asked questions
What is the average sea temperature at Inch Beach in September?
Inch Beach averages 15.0°C in September, based on long-run climatology for the Celtic Sea.
Is the sea warm enough to swim at Inch Beach in September?
Not without thermal protection — a wetsuit is recommended at 15.0°C.
Do I need a wetsuit at Inch Beach in September?
A 3/2 mm wetsuit makes longer swims comfortable.