Sea Area Forecast
Forecast valid from: 06:00, Wednesday 16 September 2026 until 06:00, Thursday 17 September 2026
Small Craft Warning
Southwest winds will reach force 6 or higher on all Irish coasts and the Irish sea this afternoon (Wednesday), becoming confined to Irish coasts from Mizen Head to Rossan Point to Howth Head and the north Irish sea later tonight (Wednesday night) and tomorrow morning (Thursday morning).
Gale Warning
Nil
Atlantic Swell
Developing on west and north Atlantic coasts from late Wednesday night into early Thursday morning.
Meteorological Situation at 03:00 UTC
Ireland lies in a moderate to fresh west to northwest airflow, between an anticyclone of 1039hPa north of the Azores, and a depression of 994hPa centred over Norway.
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Mizen Head to Slyne Head to Fair Head
Wind: Northwest force 4 or 5, backing southwest imminent. Soon increasing southwest force 5 or 6, and occasionally force 7 between Erris Head and Malin Head. Later becoming westerly force 5 or 6. Increasing force 5 or 6 and occasionally force 7 by the end of the period.
Weather: Cloudy with isolated showers in the northwest. Rain and drizzle soon. Scattered showers developing later. Chance of mist patches later in the south.
Visibility: Reducing moderate or poor in precipitation and mist.
Forecast for Fair Head to Wicklow Head to Mizen Head and for the Irish Sea
Wind: Northwest force 4 or 5, easing westerly force 3 or 4 imminent. Soon increasing west to southwest force 4 or 5, and occasionally force 6 between Roches Point and Mizen Head. Later increasing southwest force 5 or 6. Veering westerly by the end of the period.
Weather: Fair to cloudy with isolated showers. Rain and drizzle developing soon with scattered showers later. Chance of mist patches too.
Visibility: Reducing moderate or poor in precipitation and mist.
Outlook for a further 24 hours until 06:00, Friday 18 September 2026
Moderate to strong westerly winds, will increase to near gale force along northwest and north coasts on Thursday morning and afternoon. Weather: Cloudy to fair with scattered showers. A band of rain will spread from the west on Friday morning, heavy at times.
Forecast issued at: 06:00, Wednesday 16 September 2026
All times are local unless specified
