The weather changes so quick here in Ireland that I always recommend keeping an eye on the weather forecast - it gets more accurate the closer you get. It's hard to trust anything more than 3 days ahead.
Here we have the difference from one June evening to the following morning, a big change. One day can be warm and the next cold so always carry a rain jacket and maybe some extra layers in case it gets chilly.
Of course the highly changeable nature of the Irish weather makes for some of the most dramatic photographs.