Ireland. September or October?

Based on what parameters?
I visited in October, it was set by spouse’s work trip so no choice, but I kinda would have been disappointed if I had experienced no rain in Ireland. Other than a fluke tropical storm remnant just before my arrival, weather was quite pleasant. I invested in some waterproof knee-high boots before the trip.

Recommend for what?

When visiting Ireland and the UK, I would always recommend getting as close to the summer soltice as possible. September will be nicer, less rainy, and have longer days.

I would say historically September weather is better than October. But October is not bad either. However, the only predictable thing about Irish weather is its unpredictability.

Thank you. I booked RS Tour starting September 12, 2027

Having just moved here the end of August, I would say (at least this year and with Ireland weather prediction is hard) that September was still pretty summery. Fall has definitely arrived since we hit October (Temperature-wise. Some rain now but not every day). But lots of layering and de-layering.