National Forecast

Issued at: 16 September 2026 22:00

TONIGHT

Outbreaks of rain will continue to spread southeastwards early tonight with clear spells and scattered showers following from the west. Lowest temperatures of 9 to 12 degrees in mostly moderate to fresh and occasionally gusty southwesterly winds, veering westerly and generally moderating, but remaining strong along some Atlantic coasts.

TOMORROW - Thursday 17th September

Fresh and blustery tomorrow with sunny spells and scattered showers, most frequent in the morning and early afternoon. The showers will become isolated in the evening. Highest temperatures of 13 to 17 degrees, in moderate to fresh and gusty westerly winds, strong in some coastal parts before moderating in the evening.

National Outlook

Thursday night: Mainly dry for much of the night with clear spells and just a few isolated showers. Cloud will increase from the west overnight, with rain and drizzle moving into western parts towards morning. Lowest temperatures of 9 to 13 degrees with westerly winds generally moderating for a time, backing southwesterly and strengthening towards morning in western coastal parts.

Friday: A cloudy day with rain becoming widespread from the west through the morning, some of that turning heavy and becoming breezy through the morning too. There'll be further scattered outbreaks of rain and drizzle through the afternoon, with hill and coastal mist and fog too. During the evening it'll become drier and clearer in the north and northwest. Humid with highest temperatures of 15 to 19 degrees, in a moderate to fresh and gusty southwest wind, stronger in coastal parts.

Friday night: Cloudy and damp at first on Friday night in many areas, with light rain, drizzle, mist and fog, but drier, fresher conditions further north with clear spells and a few showers will gradually extend southwards overnight. However, that clearance won't reach south Munster or south Leinster. Lowest temperatures of 11 to 15 degrees, mildest in the south in moderate to fresh southwest to west winds, strong and gusty along some coasts.

Saturday: Rain, drizzle, mist and fog will clear from southern parts on Saturday morning, otherwise it'll be a bright day with sunny spells and passing showers. Breezy and fresh with highest temperatures of 14 to 19 degrees, coolest in the north, in moderate to fresh southwest to west winds, strong at times along western and northern coasts.

Sunday: Sunday will bring a good deal of dry weather with a mix of cloud and sunny spells and with just a scattering of showers for a time, mainly in the north and northwest. There's a chance increasing cloud will being a little drizzle to southwestern and western coastal parts later in the day. Highest temperatures of 14 to 18 degrees, in mostly moderate westerly winds, fresh and gusty for a time in the north and northwest, easing light to moderate later.

Monday: A very mild and humid airmass will move up over the country for Monday and while a few bright or sunny spells are likely, mainly to the south and east, it'll be rather cloudy overall. There'll be some scattered outbreaks of rain and drizzle too, especially across the west and north, along with some hill and coastal mist and fog. Highest temperatures of 17 to 21 degrees in mostly moderate southerly winds.

Further outlook: Current indications suggest that high pressure will largely dominate for Tuesday and Wednesday, with a lot of dry weather in many areas and some sunny spells too. However, weather fronts coming close to western and northern areas will bring cloudier conditions at times there and a little rain and drizzle. Continuing very mild or warm with temperatures in the high teens to the low twenties.