Sea Area Forecast
Forecast valid from: 23:30, Wednesday 23 September 2026 until 00:00, Friday 25 September 2026
Small Craft Warning
South to southwest winds will reach force 6 or higher on Thursday on Irish coasts from Valentia to Rossan Point to Strangford Lough.
Gale Warning
Nil
Atlantic Swell
Developing on Atlantic coasts on Thursday night.
Meteorological Situation at 21:00 UTC
Ireland lies in a light to moderate southerly or variable airflow with an anticyclone of 1028hPa centred across the country. A cold front associated with a depression of 964hPa centred in the mid-Atlantic will spread across the country on Thursday.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Valentia to Rossan Point to Belfast Lough
Wind: Southerly force 5 to 7 imminent, later decreasing southwest force 4 to 6.
Weather: Cloudy with rain and drizzle imminent. Becoming cloudy to fair with isolated showers by the end of the period.
Visibility: Moderate or poor in precipitation, otherwise good.
Forecast for Belfast Lough to Wicklow Head to Valentia and for the Irish Sea
Wind: Southerly force 4 or 5 imminent, later becoming south to southwest force 4 to 6.
Weather: Cloudy to fair with isolated showers soon. Rain and drizzle later.
Visibility: Mostly good, decreasing moderate or poor in precipitation later.
Outlook for a further 24 hours until 00:00, Saturday 26 September 2026
Moderate to strong west to southwest winds, becoming light to moderate northwesterly in the east and south on Friday morning. Becoming moderate to strong southwest in all areas on Friday evening. Weather: Cloudy to fair with drizzle in the south and east and showers elsewhere. Rain clearing to scattered showers on Friday.
Forecast issued at: 23:30, Wednesday 23 September 2026
All times are local unless specified
