I imagine it will be a bit like it is right here in Indiana -- spring is an inconstant thing at best, but you can pretty much count on gray skies. Although I won't be disappointed if we get sunshine and gentle breezes, the weather won't bother me. (If I wanted a guarantee of sun and heat, I'd go to Aruba!)
I hope you have wonderful weather, too! We went in April 2002, and had, for the most part, sunny days and misty mornings. We always came prepared in case it changed, though! The last day we were there (we had 9 days), it poured all day. I figure we got off pretty lightly :) The gorse should be EVERYWHERE and blooming butter yellow wherever you look.
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May the light be your guide and the darkness be your comfort!