The extended range forecast, which includes the monthly and seasonal forecasts, can at times provide an insight into weather patterns in the months ahead. However, they should not be used for specific planning purposes as they have generally low skill compared with the 10-day forecast. This is because forecasts beyond one week become increasingly uncertain due to the chaotic nature of the atmosphere. Further information can be found here: Monthly and seasonal forecast explained.
Images: Shutterstock/gabriel12. Met Éireann HQ during Storm Emma 2018
Issued: Friday 27th March 2026
Week 1 – Monday 30th March to Sunday 05th April
High pressure will likely dominate, extending from the southwest, bringing largely dry and settled conditions. There will be some unsettled weather in the far north-west, but this will be the exception. Mean air temperatures will likely be a degree or so above average for this time of year.
Week 2 – Monday 06th April to Sunday 12th April
High pressure looks to remain in charge but weakened slightly. Mean air temperatures are signalled to be around normal or slightly above for this week, while there is an indication that rainfall amounts will be slightly above average in the west with eastern parts remaining closer to average.
Week 3 – Monday 13th April to Sunday 19th April
Current indications show neither high nor low pressure dominating, meaning conditions are likely to be more changeable. Mean air temperatures are signalled to be above average and precipitation amounts below normal overall.
Week 4 – Monday 20th April to Sunday 26th April
There is a slight signal for more unsettled conditions overall, with an indication for slightly higher than average rainfall amounts, while mean air temperatures are signalled to be close to normal.
Seasonal Outlook for April, May, and June (AMJ) forecast
The signal from the C3S seasonal models for Ireland during the AMJ period is for above average temperatures. Rainfall amounts are less certain with the possibility of precipitation trending near average overall.
Mean temperatures during AMJ are signalled to be above average overall. Temperatures are likely to trend between 0.2 and 1.0°C above average generally. The potential for warmer than average temperatures increases through the period.
The rainfall forecast is less certain with no clear signal for above or below average rainfall overall. There is potential for both wetter and drier spells within the three months.
The sea surface temperatures around Irish coasts and over the Atlantic are expected to be above average during AMJ, trending 0.2 to 1.0°C degrees higher than normal generally. Sea surface temperatures are expected to be highest in comparison to average away from northwest coasts.