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 06 JUNE 2025
Week 1 (Monday 09 June to Sunday 15 June)
For week 1, low pressure to the northwest will likely dominated our weather, bringing somewhat unsettled conditions. Precipitation amounts will likely be above average for early June, with strongest signals over the northern half of the country, whereas temperature values will likely trend above average due to a predominately southwesterly airflow.
Week 2 (Monday 16 June to Sunday 22 June)
By week 2, a signal for high pressure enters the forecast, leading to a likelihood of largely settled conditions. Precipitation amounts will likely be below average, with temperatures trending above average.
Week 3 (Monday 23 June to Sunday 29 June)
By week 3, the signal for high pressure remains, however as uncertainty increases the signal is not as strong as week 2. Nevertheless temperatures are again expected to trend higher than average, and precipitation amounts are likely to be below average.
Week 4 (Monday 30 June to Sunday 06 July)
For week 4, uncertainty in the forecast increases, with little in the way of any pressure pattern dominating our weather. However, there is some signal that temperature values will be above average, with little to no signal for precipitation amounts.
SEASONAL OUTLOOK FOR June July August (JJA)
The signal from the C3S seasonal models for Ireland during the JJA period is for above average temperatures with average rainfall overall.
Mean temperatures during JJA are very likely to be above average. Temperatures are likely to trend between 0.5 and 1.0°C above average generally for the three-month period, with a signal for mean temperatures to trend between 1.0°C and 2.0°C above average for the south and east during June.
The rainfall forecast is less certain with the potential for both wetter and drier periods through JJA. There is a signal for wetter than average conditions in June and drier than average conditions in August, while July has no definitive signal either way.
The sea surface temperatures around Irish coasts and over the Atlantic to the west and south of Ireland are expected to be above average during JJA, trending 0.5 to 2.0°C higher than normal generally. Sea surface temperatures are expected to be highest in comparison to normal off the south coast.