Sea Area Forecast
Forecast valid from: 00:00, Thursday 18 September 2025 until 00:00, Friday 19 September 2025
Small Craft Warning
South to southwest winds will reach force 6 or higher at times on Wednesday night and tomorrow (Thursday) on all Irish coasts.
Gale Warning
Southwest winds will continue to reach gale force 8 for a time on Wednesday night on Irish coastal waters from Erris Head to Bloody Foreland to Fair Head.
Atlantic Swell
On Atlantic coasts early tonight
Meteorological Situation at 21:00 UTC
A depression of 982hPA is centred approximately 260 nautical miles northwest of Malin Head, extends a mostly fresh to near gale southwesterly airflow over Ireland. A frontal trough approaches the southwest coast of Ireland.
Gale Warning: In effect
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Irish coastal waters from Slyne Head to Bloody Foreland to Fair Head
Wind: Southwesterly force 6 to gale force 8. Decreasing southwesterly force 5 to 7 imminent. Soon decreasing south to southwest force 4 or 5. Later backing southeasterly before veering southwesterly and increasing force 4 to 6, occasionally touching force 7 between Slyne Head and Malin Head.
Weather: Cloudy to fair. Later becoming cloudy with outbreaks of rain and drizzle and some mist and fog patches too.
Visibility: Decreasing moderate or poor in rain, drizzle, mist or fog. Otherwise Good.
Forecast for Irish coastal waters from Fair Head to Belfast Lough to Howth Head and for the north Irish Sea
Wind: Southwesterly force 4 to 6. Soon decreasing south to southwest force 4 or 5. Later increasing southwesterly force 5 or 6 and occasionally reach force 7 in the North Irish Sea.
Weather: Fair. Soon becoming fair or cloudy. Later becoming cloudy with outbreaks of rain and drizzle and some mist and fog patches too.
Visibility: Decreasing moderate or poor in rain, drizzle, mist or fog. Otherwise Good.
Forecast for Irish coastal waters from Howth Head to Roche's Point to Slyne Head and for the south Irish Sea
Wind: Backing south to southwest force 3 to 5, imminent. Soon increasing southerly force 5 or 6. Later increasing southwesterly force 6 or 7. Decreasing southwesterly force 4 to 6 by the end of the period.
Weather: Becoming cloudy with outbreaks of rain and drizzle imminent. Some mist and fog patches too.
Visibility: Decreasing moderate or poor in rain, drizzle, mist or fog. Otherwise Good.
Outlook for a further 24 hours until 00:00, Saturday 20 September 2025
Fresh to strong southwesterly winds, reaching near gale force at times in the east during Friday night. Decreasing light to moderate variable through Friday before becoming increasing moderate to fresh northerly in the southwest, south and southeast. Weather: Cloudy to fair with rain and drizzle at times, most widespread in the south and east. Occasional mist and fog.
Forecast issued at: 00:00, Thursday 18 September 2025
All times are local unless specified
