National Forecast

Issued at: 04 August 2026 05:00

TODAY - Tuesday 4th August

Mostly cloudy and rather misty to begin with some scattered outbreaks of showery rain and drizzle in places, and with some heavy thundery downpours for a time this morning, mainly across Connacht and possibly Ulster too, with some spot flooding. It'll brighten up with some sunny spells gradually developing, along with further showers, some heavy. There's a chance of more thunderstorms into the afternoon too, with these most likely over parts of Ulster and Leinster. Humid with highest temperatures of 18 to 23 or 24 degrees, warmest in the east and south, with light to moderate southwest winds, becoming mostly moderate westerly, increasing fresh and occasionally gusty along the west coast in the evening.

TONIGHT

Mainly dry at first tonight with just isolated showers and with some clear spells, the best of these across the east and south. Cloud will increase overnight with a scattering of showers moving in from the west and with some persistent rain and drizzle spreading into parts of Ulster, north Connacht and possibly north Leinster. Lowest temperatures of 10 to 14 degrees in mostly moderate westerly winds, increasing fresh to strong and gusty in western and northwestern coastal parts.

TOMORROW - Wednesday 5th August

Tomorrow, Wednesday, will be a rather windy day, indeed windy further north, and it'll be fresher than recently. It'll be cloudy with outbreaks of rain and drizzle affecting much of Ulster, and mainly north Connacht and north Leinster, accompanied by fresh to strong and occasionally gusty westerly winds, reaching near gale or gale force in northwestern coastal parts. The rain will be heaviest and most persistent in the northwest, with some spot flooding possible. It'll be much drier and brighter elsewhere with some sunny spells and a few well scattered showers and mostly moderate to fresh and occasionally gusty westerly winds, strong at times. Highest temperatures ranging from 14 degrees in the northwest, up to 19 or 20 degrees in the southeast.

National Outlook

Overview: Cool and unseasonably breezy on Wednesday; wet too for Ulster. Well-scattered showers following on Thursday and Friday, with more widespread showers this weekend.

Tuesday Night: Becoming mainly dry for a time early on Tuesday night as showers become isolated. It will stay mostly dry in the east and south but showers will feed in from the Atlantic over western areas, with more persistent rain developing in the northwest overnight. Lowest temperatures of 11 to 14 degrees with mostly moderate westerly winds, freshening near western and northwestern coasts towards morning.

Wednesday: Cooler and rather windy on Wednesday. Current indications suggest it'll be damp or wet and unseasonably blustery with outbreaks of rain and drizzle affecting Ulster and mainly northern parts of Connacht and Leinster, accompanied by fresh to strong and gusty westerly winds. The rain will be heaviest in west and north Ulster with the potential for spot flooding there. Brighter and drier conditions further south, with a mix of sunny spells and scattered showers and mostly moderate to fresh west to northwest winds. Highest temperatures of 14 to 19 degrees. Rain or showers will ease and becoming increasingly confined to western and northern coasts on Wednesday night, leaving variable cloud and clear spells. Westerly winds will ease light to moderate overnight. Lowest temperatures of 8 to 11 degrees.

Thursday: A mix of sunny spells and scattered showers for Thursday. Cloud will increase near Atlantic coasts towards evening with patchy rain and drizzle developing. Highest temperatures of 15 to 19 degrees in a light to moderate westerly breezes.

Friday: Some bright or sunny spells in the east and south at first, but mostly cloudy conditions elsewhere, with outbreaks of rain and drizzle spreading southeastwards through the day, becoming lighter and patchier as it does so. Highest temperatures of 16 to 19 degrees with light to moderate southwesterly winds freshening near western and northwestern coasts later.

Next Weekend: Mixed and unsettled conditions look set to persist at first, with low pressure continuing to dominate. A chance of more settled conditions developing later in the weekend.