National Forecast
Issued at: 17 August 2026 08:30
TODAY - Monday 17th August
Today will be quite mild and humid. Mostly cloudy this morning with mist and some rain or drizzle, heaviest and most persistent in northern areas. Drier with some sunny intervals in the south and southwest. The rain and drizzle will become lighter and patchy during the afternoon and some sunny spells will develop, mainly in the south and southeast. However, further rain will develop in the west and north later this afternoon and will move southeast across the country this evening. Highest temperatures of 17 to 21 degrees in Ulster and Connacht. Warmer elsewhere with highest temperatures of 21 to 25 degrees in light to moderate westerly breezes.
TONIGHT
Tonight will be cloudy with outbreaks of rain in the northwest moving southeastwards early on, becoming lighter and patchier as they do. Scattered showers will follow from the west. Mild with lowest temperatures of 13 to 17 degrees in light to moderate westerly breezes.
TOMORROW - Tuesday 18th August
Tomorrow will be mostly cloudy with scattered showers, mainly affecting the west and north. Gradually becoming brighter in the afternoon with sunny spells developing. Cooler than recent days with highest temperatures of 16 to 20 degrees in light to moderate westerly breezes, fresh at times along Atlantic coasts.
National Outlook
Overview: Mixed conditions with showers or longer spells of rain at times. Occasionally breezy too with temperatures in the high teens to low twenties.
Tuesday night: Dry with clear spells for most. Scattered showers will mainly affect the west and north, becoming heavy at times in the northwest towards morning. Cooler than previous nights with lowest temperatures of 11 to 14 degrees in moderate southwesterly winds.
Wednesday: Showers will become widespread across the country, turning heavy and merging to longer spells of rain at times. Breezy with moderate to fresh westerly winds, strong at times near Atlantic coasts, with highest temperatures of 16 to 21 degrees.
Wednesday night: Showers will ease becoming mostly confined to the north and west with clear spells developing elsewhere. Lowest temperatures of 10 to 14 degrees with winds easing light to moderate and becoming northwesterly.
Thursday: Another day of showers becoming widespread and again turning heavy and prolonged in places. Highest temperatures of 15 to 20 degrees with moderate, occasionally fresh, northerly winds.
Friday: Sunny spells and showers, not as widespread as previous days with more in the way of drier weather likely. Highest temperatures of 14 to 19 degrees with moderate northerly breezes.
Further outlook: Current indications show a more settled picture for next weekend with sunny spells and just isolated showers. Temperatures will likely range from the mid to high teens.
Temperature circle (°C): maximum and minimum temperature forecast for each day. Wind symbol (km/h): arrow points in the direction the wind is blowing. The weather and wind icons: for the time of maximum temperature and minimum temperature.