Main findings ● Analysis of hydrometric data shows that Storm Claudia caused significant but not exceptional flooding, with several rivers in Wexford and Wicklow recording their highest or second-highest peaks, although on short records; longer-term records show the event had a return period of roughly 20–30 years, indicating it was moderately rare rather than extreme. ● In comparison to a pre-industrial climate, the magnitude of the rainfall associated with the 2-day event in Dublin, Wexford and Wicklow has increased by nearly 12%. ● With further global warming we expect similar 2-day rainfall events to have a further 1%, 3%, and 8% increase in magnitude from today for climates 1.5°C, 2.0°C, and 3.0°C warmer than pre-industrial levels respectively. ● In comparison to a pre-industrial climate, the magnitude of the rainfall associated with the 30-day event in Dublin, Carlow, Kildare, Kilkenny, Laois, Louth, Meath, Wexford, and Wicklow has increased by nearly 7%. ● With further global warming we expect similar 30-day rainfall events to have a further 0.5%, 2%, and 4.5% increase in magnitude from today for climates 1.5°C, 2.0°C, and 3.0°C warmer than pre-industrial levels respectively. ● Both the 2-day and 30-day rainfall events have already become twice as likely as would have been the case in a pre-industrial climate. On a warmer planet, with 3.0°C of global warming, we would expect similar 2-day rainfall events to happen once every 1-2 years and 30-day rainfall events to happen once every 2 years.