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: 29/09/2026 13:00
Week 1 – Monday 05th October to Sunday 11th October
High pressure is becoming more of a feature with more dry and perhaps settled weather through the week.
Temperatures will be warmer than average too.
Week 2 – Monday 12th October to Sunday 18th October
High pressure looks to slip away with lower pressure becoming more dominant. Rainfall amounts will return to
near average, but temperatures should be slightly above average too.
Week 3 – Monday 19th October to Sunday 25th October
An overall neutral pattern will emerge for week 3 with rainfall amounts near average but temperatures till slightly
above normal for this time of year.
Week 4 – Monday 26th October to Sunday 01st November
The neutral trend will likely continue, but temperatures are going to remain above average slightly with rainfall
amounts again slightly above average.
Seasonal Outlook for October, November, December (OND):
The signal from the C3S seasonal models for Ireland during the OND period is for above average temperatures. Rainfall amounts are also likely to trend above average with a strong signal for wet and unsettled conditions at times during OND.
Mean temperatures during OND are signalled to be above average overall. Temperatures during the period are likely to trend between 0.5 and 1.0°C above normal. However, colder than average periods, where winter hazards are possible, could still occur at times towards the end of OND.
The rainfall forecast for OND signals the potential for above average rainfall throughout the period, especially in the south. The highest likelihood for wetter than average conditions are signalled during November.
The sea surface temperatures (SSTs) around Irish coasts are expected to continue above average during OND, trending 0.2 to 1.0 degrees higher than normal generally.