Pack a quality rain jacket instead. Here's why an umbrella is often more hassle than help in Ireland.
Ireland is windy—especially coastal and western regions (Wild Atlantic Way). Gusts 40–60 km/h are routine; storms hit 100+. A standard umbrella inverts instantly. A storm-proof umbrella (Blunt, Senz, GustBuster) survives better but is bulky.
Irish rain is often fine, horizontal, or intermittent ("soft day"). An umbrella is overkill for mist; a waterproof breathable shell (Gore-Tex, eVent, Pertex) handles it hands-free.
Dublin, Galway, Cork, Kilkenny, Dingle—centers are walkable with dense cover: shops, pubs, cafés, museums, bus shelters. You're never far from a roof.
Holding a pint, map, phone, child's hand, or hiking pole. A jacket keeps you dry and functional.
A packable rain shell (Patagonia Houdini, Arc'teryx Zeta SL, Montane Minimus) weighs 100–200g, stuffs into a fist. A decent umbrella is 300–500g + awkward shape.
Verdict: Leave the brolly. Wear the shell. Enjoy the "soft day."