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: 02/06/2026 12:00
Week 1 – Monday 08th June to Sunday 14th June
High pressure builds across the country in week 1, with higher than average temperatures across most of the country, with more than average temperatures along the west and south coasts. Rainfall amounts will be below average across the country.
Week 2 – Monday 15th June to Sunday 21st June
During week 2, there is no clear signal for a dominating pressure signal, but temperatures are expected to remain above average, with lower than average precipitation amounts continuing.
Week 3 – Monday 22nd June to Sunday 28th June
Uncertainty in the forecast decreases into week 3. No dominating pressure pattern signal is evident, but temperatures are signalled to remain above average. However, there is a trend change in precipitation amounts, with average or slightly above in the west.
Week 4 – Monday 29th June to Sunday 05th July
In week 4, there is little confidence in the forecast. A slight signal for high pressure returns indicating a return to more settled conditions with lower than average rainfall amounts also indicated. Temperatures will remain average for the time of year, with slightly warmer temperatures possible along the eastern half of the country.
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.