The Weather!, County Kerry
Not exactly a danger, unless you are hiking and completley unprepared, but as you can imagine the weather here can change in an instant! The higher you go into the mountains, the wetter it gets and the closer you are to the coast the windier it gets!!!
This will not spoil your trip, but will add to the scenery and atmosphere! Honestly, a place you passed 10 minutes ago will look so different in the different weather conditions!!