Weather Late May?

Hi Everyone,
We are flying out on May 27th from Glasgow till 4th of June we usually go in Aug/Sept but have been first week in May and found the weather lovely during the day and cold at nite, could anyone please advise us what the weather will be like at this time in May/June and will we need a cardy at night.
Many Thanks.
Tracyx
We are flying out on May 27th from Glasgow till 4th of June we usually go in Aug/Sept but have been first week in May and found the weather lovely during the day and cold at nite, could anyone please advise us what the weather will be like at this time in May/June and will we need a cardy at night.
Many Thanks.
Tracyx
