Ireland in September
The secret champion: the sea holds 24 to 26 °C after summer, crowds vanish with the school year and prices drop by a third. The south (Crete, Sicily, Calabria) stays swimmable all month.
Ireland in September: what does it cost?
The calculator already has this month's dates filled in. It compares flights from your airports, driving and the ferry, and adds the total cost.
The numbers for September
Climate: 8 year averages (Open-Meteo). Flights: cheapest return fare per person found from Prague or Vienna (Aviasales, ~48 h).
How to get there
Cheap direct routes serve Dublin and Cork. A rental car unlocks the cliffs and countryside, just mind the left side driving and narrow rural roads. Intercity buses cover towns but not the Ring of Kerry.
By plane
Nearest airports: DUB, ORK. The calculator searches all of them at once, across your whole date window.
Frequently asked
How warm is the sea in Ireland in September?
In September the sea is typically around 16 °C and the air averages 17 °C during the day.