Ulster
Issued at: 18 September 2025 13:00
TODAY - Thursday 18th September
Mostly cloudy this afternoon with rain at times. Highest temperatures of 13 to 16 degrees. Light to moderate southerly winds , increasing moderate to fresh southwest this evening.
TONIGHT
Mostly cloudy tonight, with some rain and drizzle for a time. Lowest temperatures of 11 to 13 degrees in moderate to fresh southwest winds, decreasing light to moderate.
Pollen Forecast
Low on Wednesday and Thursday.
Solar UV Index
Low to moderate on Tuesday and Wednesday.
TOMORROW - Friday 19th September
Tomorrow, Friday, is going to be a mainly dry day, with some bright or sunny spells extending from the west. Highest temperatures of 15 to 17 degrees in light to moderate southwest to west winds.
National Outlook
Summary: The weekend brings the potential for some unsettled wet and possibly windy conditions, especially to the south and east, but with the possibility for those conditions to be more widespread. It's going to turn much cooler over the weekend. Current indications are for a much improved weather picture for the early days of next week, with high pressure building in from the west, though it's going to continue cool.
An area of low pressure to the south of Ireland is likely to send up some rain from the south on Friday night. There's still uncertainty though as to how widespread the rain will become. At the moment though, it looks like Munster and Leinster are most likely to see some rain, especially southern and eastern parts, some of it heavy. Lowest temperatures of 9 to 14 degrees in light to moderate breezes, becoming mostly northerly and freshening in southern areas.
The area of low pressure to our south will continue to dominate our weather on Saturday. There'll be some heavy spells of rain, particularly in the south and east. While it may hold mainly dry elsewhere, there is the possibility of more widespread heavy, possibly thundery, rain. There's also the potential for it to become breezy or rather windy with freshening northerly winds, possibly stronger in parts. Highest temperatures of 12 to 17 degrees.
The uncertainty continues into Saturday night, but there'll be further wet and breezy or rather windy conditions, especially in the east, but again with the potential to be more widespread. Lowest temperatures of 6 to 10 degrees.
On Sunday morning, it's likely to be still be wet and blustery in the east at first, though the rain should clear eastwards through the morning. Otherwise it's going to be a cool, breezy day, with sunshine and a scattering of showers. Highest temperatures of 11 to 14 degrees and feeling cooler than that with the added wind chill effect from a fresh and gusty northerly wind, which will be stronger in some coastal parts.
By Monday, the winds will have moderated and while there'll still be a few scattered showers around, mainly in the north, it'll be mostly dry with some spells of sunshine, as high pressure becomes the dominant influence on our weather. Continuing cool with highest temperatures of 11 to 14 degrees with moderate northerly winds easing mostly light.
High pressure will continue to bring dry weather on Tuesday with a mix of cloud and sunshine. Highest temperatures of 11 to 14 degrees in light northerly or variable breezes.
By Wednesday, uncertainty comes back into the forecast. It's likely that high pressure may hold on to give continued settled conditions, but with a chance that a weather front will move in from the west, bringing a return to more unsettled conditions.
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.