CARDI'S?!

You'll be fine without them, it will feel positively tropical compared to here when you arrive,

I've been in early May for the last few years and even if it's been dull the odd day or had an odd shower, (and this has only happened on one or two days) it was still warm.
I'm with Bec on the vodka thing, not even a shiver after a couple

, and I'm sure good old Effes has the same effect eventhough i'm not a lager drinker
Have a great time, and if you take a cardi, you will only need a light one.