Sea Area Forecast
Forecast valid from: 12:00, Tuesday 16 September 2025 until 12:00, Wednesday 17 September 2025
Small Craft Warning
Southeasterly winds, veering southwesterly, will reach force 6 or higher from Tuesday evening on all Irish coasts.
Gale Warning
1. Southeasterly winds veering southwesterly will reach gale force 8 at times tonight (Tuesday night) and for a time on Wednesday morning, on Irish coastal waters from Mizen Head to Malin Head to Carnsore Point and on the Irish Sea South of Anglesey. 2. South to southwest winds will reach gale force 8 at times tomorrow afternoon (Wednesday) on Irish coastal waters from Slyne Head to Rossan Point to Malin Head.
Meteorological Situation at 09:00 UTC
Ireland lies in a moderate to strong westerly airflow, in a ridge of high pressure, extending from an anticyclone of 1028hPa centred over western Europe. A depression of 998hpa centred in the mid-Atlantic, continues to deepen and track northeastwards. Its associated frontal troughs approach the southwest of Ireland.
Gale Warning: In effect
Small Craft Warning: In effect
Heavy Swell (>4m) : Nil
Forecast for Irish coastal waters from Mizen Head to Slyne Head to Rossan Point
Wind: Backing southerly and increasing force 4 or 5 imminent, force 6 in the southwest. Soon increasing southeasterly force 6 to gale force 8 and gusty, veering southwesterly in the southwest. Later veering southwesterly force 6 or 7 and gusty.
Weather: Becoming cloudy imminent with outbreaks of rain spreading from the southwest, becoming heavy at times soon. Occasional mist patches. Later becoming cloudy to fair with isolated showers.
Visibility: Decreasing moderate or poor in precipitation, mist and fog. Otherwise good.
Forecast for Irish coastal waters from Rossan Point to Belfast Lough to Howth Head and for the North Irish Sea
Wind: Decreasing west to southwest force 4 or 5 imminent. Soon backing south to southwest force 3 or 4, force 5 or 6 in the northwest. Later increasing southeasterly force 6 to gale force 8 and gusty. Veering southwesterly later and decreasing force 5 to 7.
Weather: Cloudy to fair with isolated showers. Becoming cloudy soon and later, with outbreaks of rain spreading northeastwards, heavy at times. Occasional mist patches. Becoming cloudy to fair towards the end of the period, with isolated showers.
Visibility: Decreasing moderate or poor in precipitation, mist and fog. Otherwise good.
Forecast for Irish coastal waters from Howth Head to Carnsore Point to Mizen Head and for the South Irish Sea
Wind: Backing southwesterly force 4 or 5 imminent. Soon increasing southerly force 5 to 7. Later increasing south or southwest force 6 or 7, reaching gale force 8 in the east and on the south Irish Sea. Veering southwesterly and decreasing force 5 or 6 on Wednesday morning.
Weather: Cloudy to fair. Becoming cloudy imminent and soon, with rain spreading from the southwest, heavy at times. Occasional mist and fog soon and later. Improving mostly cloudy to fair later away apart from the southeast the south Irish Sea.
Visibility: Decreasing moderate or poor in precipitation, mist and fog. Otherwise good.
Outlook for a further 24 hours until 12:00, Thursday 18 September 2025
Wind: Strong to near gale force southwesterly winds, reaching gale force on Wednesday in the northwest. Winds will gradually ease mostly moderate to strong on Wednesday night, before increasing near gale force again in the south and east. Weather: Mostly cloudy to fair with isolated showers. Showery outbreaks of rain will move up from the south Wednesday night, along with occasional mist and fog.
Forecast issued at: 12:00, Tuesday 16 September 2025
All times are local unless specified
