National Forecast

Issued at: 18 September 2026 08:30

TODAY - Friday 18th September

Cloudy and rather breezy with outbreaks of rain, heavy at times, spreading eastwards through the morning and afternoon. The rain will clear away later this afternoon, but it will be followed by outbreaks of patchy light rain and remaining rather overcast. Some limited dry spells mainly in the south and west later in the day. Highest temperatures of 15 to 18 degrees in moderate to fresh and gusty southwest winds, stronger for exposed coasts.

TONIGHT

Mostly cloudy at first with scattered outbreaks of mainly light rain and drizzle, along with some mist and hill fog. A clearance will follow from the northwest though overnight, with a few scattered showers following too, these mainly in the north and parts of the west. Mild with temperatures not falling below 11 to 15 degrees in moderate to fresh and occasionally gusty southwest winds, stronger in exposed coastal parts.

TOMORROW - Saturday 19th September

Tomorrow, Saturday, will be breezy generally, with a lot of dry weather overall and some bright or sunny spells. There'll be some scattered mostly light showers too though, these mainly affecting the northern half of the country. Highest temperatures of 14 to 19 degrees in moderate to fresh and occasionally gusty southwest to west winds, stronger in the north and northwest, but the winds will gradually moderate from the south through the day.

National Outlook

While there will be some rain and drizzle at times in places, there'll be a lot of dry weather for the early days of next week, as high pressure builds. Becoming warm and humid too.

Saturday night: There'll be a few scattered showers in northern parts and rather cloudy in southwestern coastal parts with few spots of drizzle, otherwise it'll be a dry night with clear spells. Lowest temperatures of 8 to 13 degrees with westerly winds generally easing light to moderate, continuing fresh though in parts of the north and northwest.

Sunday: Apart from a few isolated light showers in Ulster and cloudy conditions in the far southwest, with a few spots of drizzle and mist there, it'll be dry for most for much of Sunday with some bright or sunny spells. Cloud will continue to build further from the southwest through the day, with a little patchy light rain and drizzle in other parts of the southwest and west later, mainly in the evening. Highest temperatures of 14 to 19 degrees in mostly light to moderate westerly breezes, a little fresher at first in coastal parts of the north and northwest, backing southerly later.

Sunday night: Mostly cloudy on Sunday night with some rain and drizzle spreading northeastwards, along with some hill and coastal mist and fog. Winds will be mostly moderate southerly and will be dragging up very mild and humid air over the country, with temperatures not falling below 11 to 16 degrees.

Monday: A cloudy start on Monday with a little patchy light rain, drizzle, mist and fog for a time. However, it'll become mostly dry later in the morning, with just the odd patch of drizzle or light shower for the afternoon and evening. While it'll gradually brighten up too through the afternoon, with some sunny spells developing, it'll likely stay mostly cloudy and possibly misty along some windward coasts of the south and west. Very mild or warm and humid with highest temperatures of 18 to 24 degrees in mostly moderate south to southwest winds, warmest away from southern and western coasts.

Monday night: A very mild and humid night with a lot of dry weather and some clear spells, though with a little drizzle, mist and fog. Lowest temperatures of 13 to 16 degrees in light to moderate southerly winds.

Tuesday will bring a good lot of dry weather with some bright or sunny spells, the best of these across the south and east. It'll probably be cloudier in the west and north, with the likelihood that a weather front will bring some rain and drizzle there. Very mild or warm with highest temperatures of 17 to 22 degrees in mostly moderate south to southwesterly winds, warmest across the midlands, south and east.

Wednesday: There's more uncertainty by Wednesday, with the chance that the weather front will track eastwards across the country, bringing outbreaks of rain. However, there's also the chance that high pressure may hold on for a little longer.