National Forecast

Issued at: 18 September 2025 05:03

TODAY - Thursday 18th September

Become mostly cloudy today, with outbreaks of rain and drizzle across the southern areas at first, feeding northwards through the morning and afternoon, along with mist and some hill and coastal fog. Some drier and limited brighter intervals will develop at times, away from the south coast. Feeling mild, with highest temperatures of 16 to 20 degrees, in light to moderate southerly or variable winds, freshening from a south to southwest direction through the day, and increasing strong at times in some coastal parts.

TONIGHT

Cloudy tonight, with further outbreaks of rain and drizzly, mainly affecting Munster, Leinster and east Ulster, and it'll be most persistent across southern and some eastern counties. Some western and northern areas are likely to hold mostly dry, with the rain becoming mostly confined to the south and east towards morning. There'll be some hill and coastal mist and fog too, especially in the south. Lowest temperatures of 11 to 16 degrees in moderate to fresh southwest winds, generally decreasing light to moderate.

TOMORROW - Friday 19th September

Any lingering rain, drizzle, mist and fog, in the east and south will generally clear eastwards on Friday morning, though it may linger in the far southeast throughout the day. Otherwise it'll become mainly dry with some bright or sunny spells extending from the west, though it's likely to stay mostly cloudy in eastern and southern counties. Highest temperatures of 15 to 19 degrees in mostly light to moderate southwest to west or variable winds.

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 fairly 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.