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: 05/06/2026 11:00
Week 1 – Monday 08th June to Sunday 14th June
During week 1, Ireland’s weather will be largely unsettled with low pressure dominating. This will steer a
predominantly westerly airflow across the country, which will bring spells of rain and showers from the Atlantic.
Rainfall amounts will be above average as a result, with the wettest conditions in the west and north. It will also be
cooler than average nationwide.
Week 2 – Monday 15th June to Sunday 21st June
There is a signal for high pressure closer to Ireland during week 2, which may bring more settled conditions than
previously. Rainfall amounts will be slightly below average across the country, with longer dry spells likely to
develop. Temperatures will rise to above average nationwide.
Week 3 – Monday 22nd June to Sunday 28th June
There is increasing uncertainty in the trend for week 3. There is potential for high pressure to remain nearby.
However, high pressure may decline slightly to allow more frequent rain or showers over Ireland. Precipitation
amounts will be close to or slightly below average. Temperatures will return closer to normal generally but may
remain above normal in parts of the north and east.
Week 4 – Monday 29th June to Sunday 05th July
Confidence is low in the trend for week 4. There is potential for more mixed conditions to develop, with both drier
and wetter interludes. Rainfall amounts will be slightly higher than normal as a result. Temperatures will return to
near normal nationwide.
Seasonal Outlook for June July August 2026 (JJA):
The signal from the C3S seasonal models for Ireland during the JJA period is for above average temperatures. Rainfall is likely to be below average during the period.
Mean temperatures during JJA are signalled to be above average overall. Temperatures are likely to trend between 0.2 and 1.0°C above average generally. The likelihood of higher than normal temperatures is strongest in August.
The rainfall forecast is less certain, with a weak signal for below average rainfall overall, especially during June and August.
The sea surface temperatures around Irish coasts are expected to continue slightly above average during JJA, trending 0.2 to 0.5°C degrees higher than normal generally.