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: 12/06/2026 14:00
Week 1 – Monday 15th June to Sunday 21st June
It looks set to turn more unsettled during the week as High Pressure shifts towards Central Europe. Low Pressure
will become more dominant with a mobile southwesterly air-flow forecast to cover Ireland feeding in spells of rain
and showers from the Atlantic. Rainfall totals are forecast to be generally above normal during the week,
especially in the west. It looks set to be slightly warmer than the June average.
Week 2 – Monday 22nd June to Sunday 28th June
Conditions look set to remain rather changeable and mixed towards the end of June. Mean air temperatures are
forecast to be close to the climatological average. Meanwhile, there is a trend for wetter than normal conditions
over Ireland.
Week 3 – Monday 29th June to Sunday 05th July
The signal in the forecast at Week 3 is weak. There is a slight trend towards cooler than average temperatures
over Ireland. Meanwhile, rainfall totals are forecast to be close to the climatological average.
Week 4 – Monday 06th July to Sunday 12th July
By Forecast Week 4, there is limited trend and low confidence in the forecast. Mean air temperatures are likely to
trend close to average whilst there is a slight trend towards drier than normal conditions.
Seasonal Outlook for July August September 2026 (JAS):
The signal from the C3S seasonal models for Ireland during the JAS period is for above-average temperatures. Rainfall is likely to be below average during the period.
Mean temperatures during JAS are signalled to be above average overall; all three months are likely to trend between 0.5 and 1.0°C above normal. The likelihood of higher-than-normal temperatures is strongest in September.
The rainfall forecast is less certain, with a weak signal for below-average rainfall overall, especially during July.
The sea surface temperatures around Irish coasts are expected to continue slightly above average during JAS, trending 0.2 to 1.0°C degrees higher than normal generally, with the highest anomalies expected off southern and eastern coasts.