Sea Area Forecast
Forecast valid from: 00:00, Tuesday 16 September 2025 until 00:00, Wednesday 17 September 2025
Small Craft Warning
1. Westerly winds will reach force 6 or higher on all Irish coasts tonight (Monday) and tomorrow morning (Tuesday). 2. Southerly winds will reach force 6 or higher tomorrow evening (Tuesday) on Irish coasts from Wicklow Head to Mizen Head to Bloody Foreland.
Gale Warning
1. Westerly winds will reach gale force for a time tonight on the north Irish Sea. 2. Southeasterly winds, veering southwesterly will reach gale force 8 from tomorrow evening (Tuesday) on Irish coastal waters from Roches Point to Slyne Head to Rossan Point.
Atlantic Swell
On southwestern coasts early tonight (Monday night).
Meteorological Situation at 21:00 UTC
A depression of 985hPa, centred over the North Sea and an anticyclone of 1029hPa, centred to the west of Portugal, generate a mostly strong to near gale force westerly airflow over Ireland.
Gale Warning: In effect
Small Craft Warning: In effect
Heavy Swell (>4m) : yes
Forecast for Irish coastal waters from Carnsore Point to Valentia to Rossan Point
Wind: Decreasing westerly force 4 or 5 imminent. Soon decreasing force 3 or 4. Later backing southerly and increasing force 6 to gale force 8 by the end of the period.
Weather: Cloudy to fair with isolated showers. Cloudy soon with outbreaks of rain spreading from the southwest, heavy at times later. Some fog patches too.
Visibility: Decreasing moderate or poor in precipitation and fog.
Forecast for Irish coastal waters from Rossan Point to Malin Head to Belfast Lough
Wind: Westerly mainly force 5 or 6. Soon decreasing force 4 or 5, occasionally force 6. Later decreasing force 3 or 4 before backing southeasterly and increasing force 4 to 6 by the end of the period.
Weather: Showers or longer spells of rain, heavy at times, becoming cloudy to fair soon with isolated showers. Cloudy later with outbreaks of rain spreading from the southwest.
Visibility: Decreasing moderate or poor in precipitation.
Forecast for Irish coastal waters from Belfast Lough to Howth Head to Carnsore Point and for the Irish Sea
Wind: Decreasing westerly force 5 to 7 imminent, strongest on the north Irish Sea. Soon decreasing force 4 to 6. Later backing southerly.
Weather: Showers or longer spells of rain, mainly in the northeast. Cloudy to fair soon with isolated showers. Cloudy later with outbreaks of rain spreading from the southwest.
Visibility: Decreasing moderate or poor in precipitation.
Outlook for a further 24 hours until 00:00, Thursday 18 September 2025
Strong to gale force southeasterly winds, veering southwesterly. Winds will ease mostly fresh to near gale force by the end of the period. Weather: Outbreaks of rain, heavy at times, with fog patches possible in the south at first. The rain will clear northeastwards Wednesday morning. Showery outbreaks of rain will move into the south later.
Forecast issued at: 00:00, Tuesday 16 September 2025
All times are local unless specified
