As is the case with Irish weather generally, it can vary. It can be quite warm and dry some years and other years it can be wet. See the link for details on recent years weather in September.
About 15°C, but it can be a lot higher sometimes. Check the site below for more details on Ireland's weather and climate.
thats like asking what the climate in America is like..... it varies from where you go. southern Italty is pretty hot, Ireland is freezing
wet rainy mild or cold
This is because rainforests are closer to the equator than Ireland is, we have a temperate climate.
It is very sunny and maybe sometimes light rain
It is really rainy, humid and pretty nice overall. Not very cold...
usually wet , sometimes freezing, occasionally sunny and cold.
Cold Temperate
Warm and moist
Sounds like my homeland, England with Scotland being the other country.
Ireland's climate and weather is notoriously unpredictable. So any given month can vary from year to year. May is generally mild, with some rain and some very good weather. See the link below.
Because of the climate