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: 16/06/2026 14:00
Week 1 – Monday 22nd June to Sunday 28th June
The forecast for the last week of June suggests a return to more settled weather with high pressure dominating.
While some rain is possible, mainly in the west and north, rainfall amounts are expected to be below average for
the time of year. Temperatures are forecast to be a little higher than normal for late June, with daytime
temperatures getting into the low twenties in places.
Week 2 – Monday 29th June to Sunday 05th July
Moving into the start of July, the weather may become more changeable and sometimes unsettled, with rainfall
amounts near or higher than the climatological average. Temperatures are forecast to be near or slightly higher
than normal.
Week 3 – Monday 06th July to Sunday 12th July
The prediction for Week 3 is for mixed conditions, with rainfall amounts near or below normal. Temperatures are
forecast to be near or slightly above normal.
Week 4 – Monday 13th July to Sunday 19th July
While confidence is low for Week 4, there is a signal for a change to more unsettled weather with above average
rainfall amounts and average temperatures.
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.