National Forecast

Issued at: 18 September 2025 21:40

TONIGHT

Mostly cloudy tonight with patchy outbreaks of rain and drizzle at first. More persistent spells of rain will develop in parts of Munster, Leinster and east Ulster overnight, with some heavy bursts possible. Hill and coastal fog will occur too. Lowest temperatures of 11 to 16 degrees with moderate southwest winds decreasing light overnight.

TOMORROW - Friday 19th September

Damp or wet to begin on Friday in the south and east with outbreaks of rain, heavy at times. Drier and brighter conditions in parts of the west and northwest will edge slowly southeastwards through the morning and afternoon, but rain will persist for much of the day in east Munster and south and east Leinster. Highest temperatures of 15 to 18 degrees with mostly light to moderate southwest or variable winds, fresh for a time near the west and northwest coast.

National Outlook

Summary: The weekend brings the potential for some unsettled wet and possibly windy conditions, especially to the south and east, but with the possibility for those conditions to be more widespread. It's going to turn much cooler over the weekend. Current indications are for a much improved weather picture for the early days of next week, with high pressure building in from the west, though it's going to continue cool.

An area of low pressure to the south of Ireland is likely to send up some rain from the south on Friday night. There's still uncertainty though as to how widespread the rain will become. At the moment though, it looks like Munster and Leinster are most likely to see some rain, especially southern and eastern parts, some of it heavy. Lowest temperatures of 9 to 14 degrees in light to moderate breezes, becoming mostly northerly and freshening in southern areas.

The area of low pressure to our south will continue to dominate our weather on Saturday. There'll be some heavy spells of rain, particularly in the south and east. While it may hold mainly dry elsewhere, there is the possibility of more widespread heavy, possibly thundery, rain. There's also the potential for it to become breezy or rather windy with freshening northerly winds, possibly stronger in parts. Highest temperatures of 12 to 17 degrees.

The uncertainty continues into Saturday night, but there'll be further wet and breezy or rather windy conditions, especially in the east, but again with the potential to be more widespread. Lowest temperatures of 6 to 10 degrees.

On Sunday morning, it's likely to be still be wet and blustery in the east at first, though the rain should clear eastwards through the morning. Otherwise it's going to be a cool, breezy day, with sunshine and a scattering of showers. Highest temperatures of 11 to 14 degrees and feeling cooler than that with the added wind chill effect from a fresh and gusty northerly wind, which will be stronger in some coastal parts.

By Monday, the winds will have moderated and while there'll still be a few scattered showers around, mainly in the north, it'll be mostly dry with some spells of sunshine, as high pressure becomes the dominant influence on our weather. Continuing cool with highest temperatures of 11 to 14 degrees with moderate northerly winds easing mostly light.

High pressure will continue to bring dry weather on Tuesday with a mix of cloud and sunshine. Highest temperatures of 11 to 14 degrees in light northerly or variable breezes.

By Wednesday, uncertainty comes back into the forecast. It's likely that high pressure may hold on to give continued settled conditions, but with a chance that a weather front will move in from the west, bringing a return to more unsettled conditions.