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: 26/05/2026 14:00
Week 1 – Monday 01st June to Sunday 07th June
In week 1 there is a signal for lower pressure to become dominate, indicating a change to more unsettled
conditions compared to late. There is a weak signal for lower than average temperatures across most of the
country, with the exception of the east where there is no dominating signal. Precipitation anomalies also indicate
higher than average for the time of year.
Week 2 – Monday 08th June to Sunday 14th June
In week 2, there is no clear indication of a pressure trend, with a very slight signal for high pressure to move in
from the south. Similarily, there is no indication of temperature anomalies suggesting that temperatures will be
average for the time of year. The signal for higher precipitation remains in week 2, albeit slightly weaker.
Week 3 – Monday 15th June to Sunday 21st June
Uncertainty in the forecast decreases going into week 3. Current indications suggest higher pressure across the
country with warmer than average temperatures. With the precipitation anomaly also signalling below average
temperatures, it suggests a return of more settled weather.
Week 4 – Monday 22nd June to Sunday 28th June
In week there is greater uncertainty in the forecast. While there remains no clear pressure anomaly, except for
northern fringes, the warmer than average temperature anomaly remains. Week 4 also indicates drier conditions
with lower than average rain expected.
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.