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: 09/06/2026 11:00
Week 1 – Monday 15th June to Sunday 21st June
Current indications are that the week will start out warm and largely dry. However, there are signs that High Pressure will begin to lose its influence over Ireland’s weather during the week, with Low Pressure systems in the Atlantic becoming more dominant. Mean air temperatures are forecast to trend above the climatological average. Rainfall totals are forecast to be below the seasonal norm.
Week 2 – Monday 22nd June to Sunday 28th June
At Forecast Week 2, there are indications for a mobile south or southwesterly air-flow to become established over Ireland, feeding in rain and showers at times. Rainfall totals are forecast to trend above normal. Mean air temperatures are likely to be slightly above the June average.
Week 3 – Monday 29th June to Sunday 05th July
There is a slight trend towards High Pressure dominance for the early days of July. Mean air temperatures are forecast to trend slightly above the climatological average. Rainfall totals look set to be around or slightly below the seasonal norm.
Week 4 – Monday 06th July to Sunday 12th July
There is little trend in the forecast at Week 4. There is a slight indication for temperatures being above normal, especially in the east. There is a slight trend towards rainfall amounts being below normal, also.
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.