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
MONTHLY FORECAST, ISSUED TUESDAY 14 OCTOBER 2025
Week 1 (Monday 20 October to Sunday 26 October)
It looks set to turn somewhat more unsettled during the week as Low Pressure becomes more dominant than in preceding weeks. Mean air temperatures are forecast to be near or perhaps slightly above the climatological average. Rainfall amounts are forecast to be slightly below normal.
Week 2 (Monday 27 October to Sunday 02 November)
At Forecast Week 2 and into the early days of November, the weather looks set to be rather mixed. Rainfall totals are forecast to be above normal across the country whilst mean air temperatures are predicted to be close to the climatological average.
Week 3 (Monday 03 November to Sunday 09 November)
There is a trend towards Low Pressure and rather unsettled weather over Ireland in Forecast Week 3. Rainfall totals are predicted to be above normal. Mean air temperatures are expected to trend close to the seasonal average.
Week 4 (Monday 10 November to Sunday 16 November)
There is a weak signal at Forecast Week 4, for Low Pressure to be dominant bringing unsettled weather conditions across Ireland and northwestern Europe. Rainfall amounts are predicted to be above normal for November. Mean air temperatures are forecast to be near or above the climatological average.
Seasonal Outlook for November, December and January 2025-26 (NDJ)
The signal from the C3S seasonal models for Ireland during the NDJ period is for above average temperatures. Rainfall amounts are less certain with potential for both wetter and drier than average spells within the three months.
Mean temperatures during NDJ are signalled to be above average overall. Temperatures are likely to trend between 0.5 and 1.0°C above average generally. However, colder than average periods, where winter hazards are possible, could still occur at times.
The rainfall forecast is less certain. Generally, there is potential for both wetter and drier than normal conditions through NDJ.
The sea surface temperatures around Irish coasts and over the Atlantic are expected to be above average during NDJ, trending 0.2 to 1.0°C degrees higher than normal generally. Sea surface temperatures are expected to be highest in comparison to normal during December and January.