Réamhaisnéis limistear na farraige
Forecast valid from: 23:00, Thursday 17 September 2026 until 00:00, Saturday 19 September 2026
Small Craft Warning
1) Westerly winds will reach force 6 for a time tonight (Thursday night) on Irish coasts from Slyne Head to Malin Head to Howth Head.
2) Southwest winds will increase to force 6 or higher later tonight (Thursday night) on Irish coasts from Valentia to Erris Head to Bloody Foreland, extending to all Irish coasts through Friday morning.
Gale Warning
Nil.
Atlantic Swell
On Atlantic coasts Thursday night and Friday morning.
Meteorological Situation at 21:00 UTC
Ireland lies in a moderate to strong westerly airflow, between high pressure of 1029hPa centred to the north of the Azores, low pressure of 981hPa centred to the north of Scotland and another area of low pressure of 985hPa centred to the southeast of Greenland. A frontal system approaches from the Atlantic.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Mizen Head to Slyne Head to Erris Head
Wind: Backing southwest and increasing force 5 or 6 and gusty imminent. Soon increasing force 6 or 7 and gusty. Later decreasing mostly force 5 or 6.
Weather: Becoming cloudy imminent with rain and drizzle, persistent and heavy for a time soon, along with occasional mist and isolated fog. Becoming mostly cloudy to fair north of Loop Head towards the end of the period with isolated showers.
Visibility: Decreasing moderate to poor in precipitation, mist and fog. Otherwise good.
Forecast for Erris Head to Malin Head to Howth Head and for the North Irish Sea
Wind: Westerly force 5 to 7, backing southwest and decreasing force 5 or 6 imminent. Soon increasing south or southwest force 5 to 7 and gusty, possibly touching gale force 8 on Friday morning in the northwest. Possibly touching gale force 8 for a time on Friday afternoon on the north Irish Sea. Later decreasing mostly force 4 to 6, occasionally force 7.
Weather: Cloudy to fair with isolated showers and isolated mist. Becoming cloudy soon with rain and drizzle. Occasional mist and isolated fog, mainly later. Becoming cloudy to fair with isolated showers towards the end of the period west of Fair Head.
Visibility: Decreasing moderate to poor in precipitation, mist and fog. Otherwise good.
Forecast for Howth Head to Carnsore Point to Mizen Head and for the South Irish Sea
Wind: Westerly force 4 or 5, backing southwesterly imminent. Soon increasing force 5 or 6 and gusty. Later increasing force 6 or 7 and gusty.
Weather: Cloudy to fair. Soon and later cloudy with outbreaks of rain and drizzle. Occasional mist later.
Visibility: Decreasing moderate to poor in precipitation and mist. Otherwise good.
Outlook for a further 24 hours until 00:00, Sunday 20 September 2026
Wind: Fresh to near gale force and gusty southwest winds, gradually veering westerly and easing moderate to fresh through Saturday over the southern half of the area. Weather: Rain, drizzle, mist and any fog will continue to clear southwards on Friday night with cloudy to fair weather and scattered showers following.
Forecast issued at: 23:00, Thursday 17 September 2026
All times are local unless specified
