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 FRIDAY 01 AUGUST 2025
Week 1 (Monday 04 August to Sunday 10 August)
After an unsettled start to Week 1, high pressure will build from the south, becoming the dominate driver of our weather. However, through this transition period, our weather will be generally mixed and rainfall amounts will likely be above average for much of the country. Temperatures will be close to normal. Warnings are likely to be required for wind and possibly rain on Monday due to Storm Floris predicted to track closeby.
Week 2 (Monday 11 August to Sunday 17 August)
Week 2 is expected to be predominately settled with high pressure continuing to build from the south before shifting eastwards. A predominately southerly airflow will result in warmer than average temperatures. Drier than average conditions are also expected for much of the country though as the high pressure shifts further eastwards, that could allow some fronts to encroach into the northwest of the country leading to closer to normal rainfall amounts there.
Week 3 (Monday 18 August to Sunday 24 August)
A less clear picture is indicated for Week 3 with just weak high pressure signalled suggesting a decline on the high pressure from Week 1 and 2 but not currently expected to turn unsettled as a primarily easterly airflow will continue to bring warmer and drier than average conditions.
Week 4 (Monday 25 August to Sunday 31 August)
Similarly for Week 4, there is only a very weak signal for any surface high pressure to dominate. A primarily easterly still looks likely with warmer and drier than average conditions still expected.
Seasonal Outlook for August September October (ASO)
The signal from the C3S seasonal models for Ireland during the ASO period is for above average temperatures, with average rainfall overall.
Mean temperatures during ASO are signalled to be above average. Temperatures are likely to trend between 0.5 and 1.0°C above average over the three-month period, with higher anomalies over mainland Europe during August continuing to have an influence at times.
The rainfall forecast is less certain, with the potential for both wetter and drier periods through ASO.
The sea surface temperatures around Irish coasts are expected to continue above average during ASO, trending 0.5 to 2.0°C higher than normal.