Sea Area Forecast
Forecast valid from: 00:00, Monday 08 December 2025 until 00:00, Tuesday 09 December 2025
Small Craft Warning
1. Southwest winds will reach force 6 on all Irish coastal waters tonight (Sunday night) and tomorrow morning, afternoon and evening (Monday). 2. Southeast winds will reach force 6 on Irish coastal waters from Howth Head to Roches Point to Loop Head tomorrow night (Monday night).
Gale Warning
Atlantic Swell
On southwestern, western and northwestern coasts.
Meteorological Situation at 21:00 UTC
A broad and complex area of low pressure over the mid-Atlantic with multiple centres, including one of 971hPa located approximately 300 nautical miles northwest of Erris Head, generates a moderate to fresh or strong south to southwest airflow over the country. An active trough approaches the southwest of the country.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Irish coastal waters from Slyne Head to Malin Head to Howth Head and for the north Irish Sea
Wind: Increasing southwesterly force 6 or near gale force 7 and possibly touching gale force 8 at times, imminent. Soon decreasing southwesterly force 5 or 6. Later backing southeasterly and decreasing force 4 or 5.
Weather: Cloudy to fair with scattered showers, some heavy and with thunderstorms.
Visibility: Decreasing moderate or poor in precipitation, otherwise good.
Forecast for Irish coastal waters from Howth Head to Mizen Head to Slyne Head and for the south Irish Sea
Wind: Southwesterly force 6 or near gale force 7 and possibly touching gale force 8 at times. Soon decreasing southwesterly force 5 or 6. Later decreasing mostly force 4 or 5 and backing southeasterly before increasing force 4 to 6 by the end of the period.
Weather: Cloudy to fair with scattered showers, some heavy and with thunderstorms.
Visibility: Decreasing moderate or poor in precipitation, otherwise good.
Outlook for a further 24 hours until 00:00, Wednesday 10 December 2025
Moderate to strong southeasterly winds will gradually veer southwesterly, strengthening to gale force or higher on all Irish coastal waters through Tuesday, before mostly weakening to strong or near gale force on Tuesday night, except for in the north. Weather: Widespread rain, heavy at times, clearing northwards and followed by scattered showers.
Forecast issued at: 00:00, Monday 08 December 2025
All times are local unless specified
