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

Thursday night: Dry for much of the northwest with isolated showers. However, showery outbreaks of rain will continue to affect southern and eastern areas. Mild and humid with lowest temperatures of 11 to 15 degrees in light to moderate southwesterly winds.

Friday: Showery outbreaks of rain will affect mainly eastern parts for a time, before clearing into the Irish Sea. A mix of cloud and some bright or sunny spells elsewhere with isolated showers. Highest temperatures of 15 to 19 degrees in mostly light breezes.

Mostly dry on Friday night with light winds and calm conditions leading to some mist and fog patches. Lowest temperatures of 6 to 12 degrees. Some rain may edge into the southeast by morning.

Turning gradually cooler over the weekend with northerly winds likely to set in. A good deal of uncertainty in the details at present with current indications suggesting some wet and blustery weather may affect parts of the east and south at times, with a mix of sunny spells and scattered showers elsewhere.